Revert "Updated READMEs, test projects to match others"

This reverts commit b55fc88.

Author: Chuxel

containers/python-3-miniconda/test-project/plot.png

@@ -5,6 +5,8 @@ services:
     build: 
       context: ..
       dockerfile: .devcontainer/Dockerfile
+    ports:
+      - 5000:5000
     volumes:
       - ..:/workspace
     command: sleep infinity