DOC - Switch from using rst to markdown in docs

[rcap107]

Using RST makes updating the documentation more complicated than needed in a lot of cases. I think we should move from RST to Markdown once the documentation is in a "relatively stable" shape.

[rcap107]

Listing here some resources:

• https://docsforadobe.dev/updating-legacy-docs/converting-rst-to-md/
• https://docs.readthedocs.com/platform/stable/guides/migrate-rest-myst.html
• https://stackoverflow.com/questions/2471804/using-sphinx-with-markdown-instead-of-rest
• https://www.sphinx-doc.org/en/master/usage/markdown.html