Add latex to apt package of RTD config file

Author: Bachibouzouk

.readthedocs.yml

@@ -7,6 +7,8 @@ version: 2
 # Set the version of Python and other tools you might need
 build:
   os: ubuntu-22.04
+  apt_packages:
+    - texlive-latex-extra
   tools:
     python: "3.7"