[FLINK-15697][docs] Move python options from general configuration page to table config options page

[dawidwys]

What is the purpose of the change

Move python options from general configuration page to table config options page. Those options can not be set from flink-conf.yaml and should not be in the general page.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[dawidwys]

cc @aljoscha @sunjincheng121

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Automated Checks

Last check on commit 4d6b2d5 (Wed Jan 29 08:25:00 UTC 2020)

Warnings:

• Documentation files were touched, but no .zh.md files: Update Chinese documentation or file Jira ticket.

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[StephanEwen]

Looks good, +1

Will merge this as part of the docs rework.