Remove error from make html doc and update converter doc using Sphinx-apidoc

[oatawa1]

What this patch does to fix the issue.

Remove error when generate doc using make html which mainly from reference error.

• For converter update using autogenerate from Sphinx-apidoc.
• For optimization.rst, I fix it but I think this file is obsolete. Shall we remove it?: removed

Link to any relevant issues or pull requests.

#953 (Error part)
The warning part will be solved in another PR to reduce the amount of commit code.

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[iizukak]

@oatawa1 Thanks. We can remove optimization.rst,

[oatawa1]

@iizukak Thanks. I removed it in the latest commit

[oatawa1]

The deployment version is different from the local test version. I will fix it

[iizukak]

OA

[oatawa1]

@iizukak Thanks.

Can I merge this PR?

The current problem is the current deployment version show only the class name it should show both class name along with module and arg name.
https://deploy-preview-989--blueoil.netlify.com/converter/converter.core.html

In my opinion, I want to merge this one to fix the error problem.
Then, this Python API will be removed in #995 , because I will migrate the Python API doc to autogenerate.

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[oatawa1]

The problem of class definition and parameter disappeared in deployment is fixed in #995 . So I merged this PR first so I can make #995 ready.

[oatawa1]

/ready

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