[DNM] DEMO: how site would look like with current docs

[jaimergp]

Just a demo on how this would look like in the actual site.

Steps to get here:

1. In the conda-forge.github.io site, install sphinx-markdown-builder from https://github.com/jaimergp/sphinx-markdown-builder/archive/admonitions.tar.gz
2. Add this patch to conf.py:

diff --git a/src/conf.py b/src/conf.py
index a4daa305d..5a96a3e5b 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -36,6 +36,7 @@ extensions = [
     'sphinx.ext.todo',
     'sphinxcontrib.fulltoc',
     'sphinxcontrib.newsfeed',
+    'sphinx_markdown_builder',
 ]
 
 # Add any paths that contain templates here, relative to this directory.

3. Build for markdown:

$ cd src
$ python -m sphinx -M markdown . _build/

4. Run the script in this PR to move things to the right places:

$ cd cf-infra-docs/
$ python _scripts/sphinx_json_to_docusaurus.py ../conda-forge.github.io/src/_build/ docs/

5. Some modifications in the docusaurus config.

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This is NOT supposed to be merged. It's just for demonstration purposes. The actual implementation would go to conda-forge.github.io and run the steps above in CI. Source truth would still be the RST, with all the git history untouched.

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[jaimergp]

See conda-forge/conda-forge.github.io#2077