SUBMARINE-973. Versioning website

[KUAN-HSUN-LI]

What is this PR for?

1. Create version control on submarine website
2. Change the image relative path into absolute path. (reduce the old version doc folder size from 10MB to 500KB)
3. Beautify the Submarine home page
4. Create the submarine favicon

What type of PR is it?

[Improvement | Documentation]

Todos

• - Wait until v0.6.0 is released

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-973

How should this be tested?

Screenshots (if appropriate)

Quickstart._.Apache.Submarine.-.-.Microsoft_.Edge.2021-08-13.21-44-37.mp4

Questions:

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

[pingsutw]

Thank you for improving documentation, it's great to have different versions of docs.
Overall LGTM

[pingsutw]

@KUAN-HSUN-LI Could you fix the conflict? I'm going to merge it.

[KUAN-HSUN-LI]

@pingsutw I have sync the current doc to the version-0.6.0 doc and fix one error however the Release Note page is not ready. Thanks for your review.

[pingsutw]

Got it, Thnaks~