Fix Sphinx bugs to enable readthedocs #147
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What type of PR is this?
/kind bug
What this PR does / why we need it:
There are configuration and package-absent errors that are fixed with Sphinx codes in this PR.
Add readthedocs.yaml to enable Sphinx, which is necessary for building readthedocs projects. References are as https://stackoverflow.com/questions/60364789/how-do-i-correctly-start-using-readthedocs-yml and https://docs.readthedocs.io/en/stable/config-file/index.html
Add the try/except install session, add the extension and import the package for sphinx_rtd_theme. That is because sphinx_rtd_theme is no longer a hard dependency since version 1.4.0
Which issue(s) this PR fixes:
Related to #145 and #92