Update bluegreen.md

Author: bcb

docs/bluegreen.md

@@ -1,11 +1,9 @@
+![Blue/Green](assets/bluegreen.png)
+
 Blue/Green deployment runs two stacks side-by-side: one live, one idle. You
 deploy to the idle stack, test it, and when ready, swap roles — giving
 near-zero downtime and easy rollback.
 
-![Blue/Green](assets/bluegreen.png)
-
-## 1. Create a Docker Network
-
 Blue/Green adds some complexity because where before there was just "the
 stack", now you have:
 
@@ -14,6 +12,8 @@ stack", now you have:
 3. A front proxy to direct traffic
 4. An external Postgres.
 
+## 1. Create a Docker Network
+
 Create a network to link them:
 
 ```sh