SUBMARINE-1196. Remove administrator docs on the submarine website

[MortalHappiness]

What is this PR for?

Currently, the administrator docs on the submarine website only contain Yarn-related docs. Therefore it can be removed.

What type of PR is it?

[Improvement]

Todos

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1196

How should this be tested?

Screenshots (if appropriate)

Questions:

• Do the license files need updating? No
• Are there breaking changes for older versions? No
• Does this need new documentation? No

[pingsutw]

Should remove Administrator Docs from sidebar.js.

submarine/website/sidebars.js

Lines 53 to 57 in 92e6fe8

	"Administrator Docs": [
	{
	"Submarine on Yarn": ["adminDocs/yarn/README"],
	},
	],

[MortalHappiness]

@pingsutw I found the build fail reason. I have already removed Administrator Docs from sidebar.js. The failed reason is that the following documentation references the adminDocs. Maybe this PR can be merged after those documentation re-written PRs are merged? Or should I push a new commit to remove those references in this PR?

submarine/website/docs/ecosystem/kaldi/RunningDistributedThchs30KaldiJobs.md

Line 103 in bc2452a

For the meaning of the individual parameters, see the [QuickStart](../../adminDocs/yarn/README) page!

submarine/website/docs/userDocs/yarn/YARNRuntimeGuide.md

Line 22 in bc2452a

Check out the [Running Submarine on YARN](../../adminDocs/yarn/README)

[pingsutw]

oops, sorry. I didn't see that.
I think we can just remove Kaldi from the docs. we have those docs on the 0.6.0 website, so people still can find it in the future.

[pingsutw]

I think we could also remove the docs related to yarn under user docs.
https://github.com/apache/submarine/tree/master/website/versioned_docs/version-0.6.0/userDocs/yarn

[MortalHappiness]

@pingsutw I have pushed a new commit. Thank you.