diff --git a/package-lock.json b/package-lock.json
index 528e048..89c4a15 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -150,6 +150,148 @@
         "url-parse": "~1.4.3"
       }
     },
+    "@jupyterlab/docmanager": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/@jupyterlab/docmanager/-/docmanager-1.2.8.tgz",
+      "integrity": "sha512-onVhVbwxpgL5zkHsIj5FK7lPJGALaUatjE1dRNexglHtPTPeF7iPMEFrevlZ6TRsXnwJtlbtX8Qceatd85yaiA==",
+      "requires": {
+        "@jupyterlab/apputils": "^1.2.8",
+        "@jupyterlab/coreutils": "^3.2.0",
+        "@jupyterlab/docregistry": "^1.2.8",
+        "@jupyterlab/services": "^4.2.2",
+        "@jupyterlab/statusbar": "^1.2.8",
+        "@phosphor/algorithm": "^1.2.0",
+        "@phosphor/coreutils": "^1.3.1",
+        "@phosphor/disposable": "^1.3.0",
+        "@phosphor/messaging": "^1.3.0",
+        "@phosphor/properties": "^1.1.3",
+        "@phosphor/signaling": "^1.3.0",
+        "@phosphor/widgets": "^1.9.0",
+        "react": "~16.8.4"
+      },
+      "dependencies": {
+        "@jupyterlab/apputils": {
+          "version": "1.2.8",
+          "resolved": "https://registry.npmjs.org/@jupyterlab/apputils/-/apputils-1.2.8.tgz",
+          "integrity": "sha512-y7NL/LPKGvHlzawQsfZufAkRuuW0m0QukDX5n1swzzdOrmjv7n8HApZFKPpw0i832jadArVjkUqBV2ELQILnCQ==",
+          "requires": {
+            "@jupyterlab/coreutils": "^3.2.0",
+            "@jupyterlab/services": "^4.2.2",
+            "@jupyterlab/ui-components": "^1.2.1",
+            "@phosphor/algorithm": "^1.2.0",
+            "@phosphor/commands": "^1.7.0",
+            "@phosphor/coreutils": "^1.3.1",
+            "@phosphor/disposable": "^1.3.0",
+            "@phosphor/domutils": "^1.1.3",
+            "@phosphor/messaging": "^1.3.0",
+            "@phosphor/properties": "^1.1.3",
+            "@phosphor/signaling": "^1.3.0",
+            "@phosphor/virtualdom": "^1.2.0",
+            "@phosphor/widgets": "^1.9.0",
+            "@types/react": "~16.8.18",
+            "react": "~16.8.4",
+            "react-dom": "~16.8.4",
+            "sanitize-html": "~1.20.1"
+          }
+        },
+        "@jupyterlab/codemirror": {
+          "version": "1.2.8",
+          "resolved": "https://registry.npmjs.org/@jupyterlab/codemirror/-/codemirror-1.2.8.tgz",
+          "integrity": "sha512-uShHa7g7Tfx0N7IJjehJmCyP8oou6pKMPLQl0LWsNqhntiD3QCtDt7n5zxKaGS4Z3bStpztuHzltAb5m793WKw==",
+          "requires": {
+            "@jupyterlab/apputils": "^1.2.8",
+            "@jupyterlab/codeeditor": "^1.2.0",
+            "@jupyterlab/coreutils": "^3.2.0",
+            "@jupyterlab/observables": "^2.4.0",
+            "@jupyterlab/statusbar": "^1.2.8",
+            "@phosphor/algorithm": "^1.2.0",
+            "@phosphor/commands": "^1.7.0",
+            "@phosphor/coreutils": "^1.3.1",
+            "@phosphor/disposable": "^1.3.0",
+            "@phosphor/signaling": "^1.3.0",
+            "@phosphor/widgets": "^1.9.0",
+            "codemirror": "~5.47.0",
+            "react": "~16.8.4"
+          }
+        },
+        "@jupyterlab/docregistry": {
+          "version": "1.2.8",
+          "resolved": "https://registry.npmjs.org/@jupyterlab/docregistry/-/docregistry-1.2.8.tgz",
+          "integrity": "sha512-KJCRSRSaJSBTlylKteak9MlvTb52rM73qZpdCcmD6wiW9MJoi+9iqY7bYIdJ0T6FtW5WO4MReOCBl/udss1qzA==",
+          "requires": {
+            "@jupyterlab/apputils": "^1.2.8",
+            "@jupyterlab/codeeditor": "^1.2.0",
+            "@jupyterlab/codemirror": "^1.2.8",
+            "@jupyterlab/coreutils": "^3.2.0",
+            "@jupyterlab/observables": "^2.4.0",
+            "@jupyterlab/rendermime": "^1.2.8",
+            "@jupyterlab/rendermime-interfaces": "^1.5.0",
+            "@jupyterlab/services": "^4.2.2",
+            "@phosphor/algorithm": "^1.2.0",
+            "@phosphor/coreutils": "^1.3.1",
+            "@phosphor/disposable": "^1.3.0",
+            "@phosphor/messaging": "^1.3.0",
+            "@phosphor/signaling": "^1.3.0",
+            "@phosphor/widgets": "^1.9.0"
+          }
+        },
+        "@jupyterlab/rendermime": {
+          "version": "1.2.8",
+          "resolved": "https://registry.npmjs.org/@jupyterlab/rendermime/-/rendermime-1.2.8.tgz",
+          "integrity": "sha512-W7p3uswllwODz/ZeJPPo1FL8s7Y3X8HHQqq5NzESbF4X89BHhPGUB3olwmKd4YCNH0q5Vb7OTYh/uV/Exd6QNQ==",
+          "requires": {
+            "@jupyterlab/apputils": "^1.2.8",
+            "@jupyterlab/codemirror": "^1.2.8",
+            "@jupyterlab/coreutils": "^3.2.0",
+            "@jupyterlab/observables": "^2.4.0",
+            "@jupyterlab/rendermime-interfaces": "^1.5.0",
+            "@jupyterlab/services": "^4.2.2",
+            "@phosphor/algorithm": "^1.2.0",
+            "@phosphor/coreutils": "^1.3.1",
+            "@phosphor/messaging": "^1.3.0",
+            "@phosphor/signaling": "^1.3.0",
+            "@phosphor/widgets": "^1.9.0",
+            "lodash.escape": "^4.0.1",
+            "marked": "^0.7.0"
+          }
+        },
+        "@jupyterlab/services": {
+          "version": "4.2.2",
+          "resolved": "https://registry.npmjs.org/@jupyterlab/services/-/services-4.2.2.tgz",
+          "integrity": "sha512-1CNSsPbaAWaRkb3s5a+qpqMq/62RjLggL3MoSlGlp0Mi7jfJ8EJFIrnlRn4/a9/QwY3E3vsOFXaQ13v49PMWfA==",
+          "requires": {
+            "@jupyterlab/coreutils": "^3.2.0",
+            "@jupyterlab/observables": "^2.4.0",
+            "@phosphor/algorithm": "^1.2.0",
+            "@phosphor/coreutils": "^1.3.1",
+            "@phosphor/disposable": "^1.3.0",
+            "@phosphor/signaling": "^1.3.0",
+            "node-fetch": "^2.6.0",
+            "ws": "^7.0.0"
+          }
+        },
+        "@jupyterlab/statusbar": {
+          "version": "1.2.8",
+          "resolved": "https://registry.npmjs.org/@jupyterlab/statusbar/-/statusbar-1.2.8.tgz",
+          "integrity": "sha512-uxz6KWx7+LI8IJa/FOEamkV3kq/AqV0HfArkmDWk+sXqsVSWIGruPlIfuMy+2dl4I84Kv91YEWPvVwoxgTtngA==",
+          "requires": {
+            "@jupyterlab/apputils": "^1.2.8",
+            "@jupyterlab/codeeditor": "^1.2.0",
+            "@jupyterlab/coreutils": "^3.2.0",
+            "@jupyterlab/services": "^4.2.2",
+            "@jupyterlab/ui-components": "^1.2.1",
+            "@phosphor/algorithm": "^1.2.0",
+            "@phosphor/coreutils": "^1.3.1",
+            "@phosphor/disposable": "^1.3.0",
+            "@phosphor/messaging": "^1.3.0",
+            "@phosphor/signaling": "^1.3.0",
+            "@phosphor/widgets": "^1.9.0",
+            "react": "~16.8.4",
+            "typestyle": "^2.0.1"
+          }
+        }
+      }
+    },
     "@jupyterlab/docregistry": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/@jupyterlab/docregistry/-/docregistry-1.2.1.tgz",
@@ -915,9 +1057,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.15",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
-      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+      "version": "4.17.19",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.19.tgz",
+      "integrity": "sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ==",
       "dev": true
     },
     "lodash.clonedeep": {
diff --git a/yarn.lock b/yarn.lock
index fe677a9..bb30b70 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -881,9 +881,9 @@ lodash.mergewith@^4.6.1:
   integrity sha512-GK3g5RPZWTRSeLSpgP8Xhra+pnjBC56q9FZYe1d5RN3TJ35dbkGy3YqBSMbyCrlbi+CM9Z3Jk5yTL7RCsqboyQ==
 
 lodash@^4.17.10:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
+  version "4.17.19"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.19.tgz#e48ddedbe30b3321783c5b4301fbd353bc1e4a4b"
+  integrity sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ==
 
 loose-envify@^1.0.0, loose-envify@^1.1.0, loose-envify@^1.4.0:
   version "1.4.0"