chore: clean up documentation and fix broken links.

[maniarathi]

Reviewers

Functional: @MDunitz

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Changes

Deletions

• Removed Zenodo badge (only relevant for cellxgene Desktop).
• Remove broken links that 404'd.

Modifications

• Updated links that were pointing to the cellxgene Desktop to direct to files in this repo.
• Updated links that were pointing to the old docs site to the new one.

[codecov]

Codecov Report

Merging #252 (8a273e6) into main (25070e1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   76.12%   76.12%           
=======================================
  Files          90       90           
  Lines        6660     6660           
=======================================
  Hits         5070     5070           
  Misses       1590     1590           

Flag	Coverage Δ
frontend	76.12% <ø> (ø)
javascript	76.12% <ø> (ø)
smokeTest	?
unitTest	76.12% <ø> (ø)

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[MDunitz]

One of the links doesnt work for me and I added a small nit around phrasing.

[MDunitz]

lgtm thanks!