Add links in sidebar

[mhaoda]

Description

Add a link to the project repo in left sidebar of the documentation
#844

Changes

Notable changes that this PR has either accomplished or will accomplish. Feel free to add more lines to the itemized list
below.

• Add repo link
• Add Pypi link
• Add discord link

Checklist

Before marking your PR ready for review, make sure you checked the following locally. If this is your first PR, you might be notified of some workflow failures after a maintainer has approved the workflow jobs to be run on your PR.

Additional information is available in the documentation.

• Use ruff for errors related to code style and formatting.
• Verify all previous and newly added unit tests pass in pytest.
• Check the documentation build does not lead to any failures. Sphinx build can be checked locally for any failures related to your PR
• Use linkcheck to check for broken links in the documentation
• Use doctest to verify the examples in the function docstrings work as expected.

[purva-thakre]

LGTM!

I made a suggested change where we link the toqito channel directly instead of the general unitary fund discord.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.8%. Comparing base (5a58c20) to head (e640a00).
Report is 4 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #870   +/-   ##
======================================
  Coverage    97.8%   97.8%           
======================================
  Files         167     167           
  Lines        3263    3263           
  Branches      715     715           
======================================
  Hits         3193    3193           
  Misses         46      46           
  Partials       24      24           

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