docs: clarify Manim project choice (#2475)

Author: iamdhrv

docs/source/development/contributing.rst

@@ -3,6 +3,20 @@ Contributing
 
 Accept any contribution you make :)
 
+Choose the right Manim project first
+------------------------------------
+
+This repository is the ManimGL version used by 3Blue1Brown. It focuses on
+OpenGL rendering, interactive workflows, and the needs of the videos in
+`3b1b/videos <https://github.com/3b1b/videos>`_. Pull requests are welcome here,
+but reviews can take some time.
+
+For broad community features, packaging changes, or beginner-oriented
+documentation, also consider
+`ManimCommunity/manim <https://github.com/ManimCommunity/manim>`_, which has a
+larger contributor workflow and more active community review. If your change is
+specific to ManimGL, keep it in this repository.
+
 - **Contribute to the manim source code**: 
 
 Please fork to your own repository and make changes, submit a pull request, and fill in 
@@ -56,4 +70,4 @@ How to build this documentation
     cd docs/
     make html
 
-- The output document is located in ``docs/build/html/``
+- The output document is located in ``docs/build/html/``

docs/source/getting_started/quickstart.rst

@@ -1,6 +1,13 @@
 Quick Start
 ===========
 
+This quick start is for ManimGL, the OpenGL-based version maintained in
+`3b1b/manim <https://github.com/3b1b/manim>`_. If you are looking for the
+Community Edition, install and follow the docs from
+`ManimCommunity/manim <https://github.com/ManimCommunity/manim>`_ instead.
+The two projects use different package names and setup instructions, so choose
+the version you want before installing dependencies or copying examples.
+
 After installing the manim environment according to the instructions on the
 :doc:`installation` page, you can try to make a scene yourself from scratch.
 
@@ -253,4 +260,3 @@ You succeeded!
 After reading the above content, you already know how to use manim.
 Below you can see some examples, in the :doc:`example_scenes` page.
 But before that, you'd better have a look at the :doc:`configuration` of manim.
-