Updated installation guide for Docker setup (#318)

* Updated installation guide for Docker setup

* moved python setup below docker

Installing-Oppia.md

@@ -17,19 +17,23 @@ following:
 
 If you need to learn or brush up on these, please do so before trying to start the installation so you don't get confused by our instructions.
 
-## Standard installation using Python setup
-To install Oppia, follow these instructions:
-
-* [[Linux|Installing-Oppia-(Linux;-Python-3)]]
-* [[Mac OS|Installing-Oppia-(Mac-OS;-Python-3)]]
-* [[Windows|Installing-Oppia-(Windows;-Python-3)]]
-
-## Experimental installation using Docker - under development
+## Installation using Docker
 To install Oppia using Docker, follow these instructions:
 * [[Oppia Docker Setup|Installing-Oppia-using-Docker]]
 
 If you run into any problems during installation, please read [[these notes|Issues-with-installation]] and the [[Troubleshooting page|Troubleshooting]].
 
 Take a look at our [[guide for getting started with some common code editors|Tips-for-common-IDEs]].
 
+If you still face problems, you can open a new discussion in [discussions page](https://github.com/oppia/oppia/discussions/new/choose).
+
+## Python setup (soon to be depreciated)
+This setup is soon to be discontinued, please use Docker setup below.
+
+To install Oppia, follow these instructions:
+
+* [[Linux|Installing-Oppia-(Linux;-Python-3)]]
+* [[Mac OS|Installing-Oppia-(Mac-OS;-Python-3)]]
+* [[Windows|Installing-Oppia-(Windows;-Python-3)]]
+
 **Warning:** You should always edit Oppia code on your local machine. Do not use web-based editors like github.dev or the editor on github.com. These web-based editors won't run the automated checks that run on your local machine. Pushing without these checks just means that the tests will fail on your PR.