Update docs build and contributing instructions (#5938)

* Simplify outdated docs build script

* Remove Windows docs build script

It was completely outdated.
Also, building docs on Windows currently fails because `pm.sampling_jax` can't be imported.

* Link to contributing page in the docs

Closes #5843

Author: michaelosthege

CONTRIBUTING.md

@@ -11,3 +11,5 @@ Quick links
 * [Running the test suite](https://docs.pymc.io/en/latest/contributing/running_the_test_suite.html)
 * [Running PyMC in Docker](https://docs.pymc.io/en/latest/contributing/docker_container.html)
 * [Submitting a bug report or feature request](https://github.com/pymc-devs/pymc/issues)
+
+For a complete list visit [the contributing section of the documentation](https://docs.pymc.io/en/latest/contributing/index.html).

docs/source/contributing/build_docs.md

@@ -1,6 +1,11 @@
 # Build documentation locally
 
-To build the docs, run these commands at pymc repository root:
+:::{warning}
+Docs build is not supported on Windows.
+To build docs on Windows we recommend running inside a Docker container.
+:::
+
+To build the docs, run these commands at PyMC repository root:
 
 ```bash
 $ pip install -r requirements-dev.txt  # Make sure the dev requirements are installed
@@ -9,7 +14,7 @@ $ make html   # Build docs
 $ python -m http.server --directory docs/_build/  # Render docs
 ```
 
-Check the printed url where docs are being served and open it.
+Check the printed URL where docs are being served and open it.
 
 The `make clean` step is not always necessary, if you are working on a specific page
 for example, you can rebuild the docs without the clean step and everything should