Add Qibo conversions to documentation

[nathanshammah]

Add Qibo conversions to documentation in API-Doc and to Readme.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.28%. Comparing base (f8f1e8c) to head (99f1e7b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2214   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          90       90           
  Lines        4259     4259           
=======================================
  Hits         4186     4186           
  Misses         73       73           

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[nathanshammah]

Looks like Qibo is cut away in the RTD rendering of the Readme page. Trying to shrink all the logo sizes in the table to see if it works.

[Misty-W]

Nice resizing of the logos, LGTM!

Docs build failure is unrelated (broken links). The "broken" links still work in Chrome, so I'm re-running the docs build to see if it was due to a temporary outage. Docs build ok now.

[natestemen]

Question: There are a bunch of functions in this module that maybe don't need to go into the API-doc. E.g. all the ..._decomp functions. Should we just have the to_qibo and from_qibo functions?

[nathanshammah]

Thanks @natestemen, I've addressed the issue, it looks better now (preview).

[natestemen]

[natestemen]

BTW @nathanshammah please try to use branch name that's descriptive of what the branch contains. A few ideas about how one can do this are available here.