Initial commit for moving website/docs to docosaurus

[treff7es]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-XXX

Description

• Here are some details about my PR, including screenshots (if applicable):

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.58%. Comparing base (569cdb7) to head (486105f).
⚠️ Report is 6 commits behind head on website-collab.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             website-collab    #3292      +/-   ##
====================================================
+ Coverage             46.53%   46.58%   +0.05%     
- Complexity            10028    10048      +20     
====================================================
  Files                  2037     2037              
  Lines                 79271    79366      +95     
  Branches               8839     8861      +22     
====================================================
+ Hits                  36886    36972      +86     
- Misses                38963    38965       +2     
- Partials               3422     3429       +7     

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