Readme is repeated twice in the docs

[purva-thakre]

Previously discussed here: #2278 (comment)

If you go to the main page of the documentation, the information is from readme.md. But scroll to the bottom and navigate to the next page and we once again see the information from readme.md.

I think this is because we use readme in the toctree directive and an include directive again for the readme. One of these has to be removed. I don't really know which of the two is important for the home page but a SO answer does use the include directive for the home page.

https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#directive-toctree

mitiq/docs/source/index.md

Line 8 in 9e1cbb5

readme.md

mitiq/docs/source/index.md

Lines 16 to 18 in 9e1cbb5

	```{include} ./readme.md
	```

---

The current home page also does not let you access earlier versions of the docs. Which is why I am not too sure which of the two directives should be used: toctree or include

Earlier versions of the docs were accessible from the main landing page of https://mitiq.readthedocs.io/ but this option is no longer available on the main page after the theme was changed.

For example, see the bottom right corner of https://mitiq.readthedocs.io/en/v0.34.0/index.html

This option is available on other pages of the latest version of the docs (bottom left), just not on the main page.