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"

[treff7es]

Please don't merge it or anything, this is just a draft/initial commit for a new redesigned Gobblin website/doc to work on

[codecov-commenter]

Codecov Report

Merging #3280 (486105f) into master (569cdb7) will increase coverage by 0.01%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3280      +/-   ##
============================================
+ Coverage     46.53%   46.54%   +0.01%     
- Complexity    10028    10033       +5     
============================================
  Files          2037     2037              
  Lines         79271    79271              
  Branches       8839     8839              
============================================
+ Hits          36886    36894       +8     
+ Misses        38963    38952      -11     
- Partials       3422     3425       +3     

Impacted Files	Coverage Δ	Complexity Δ
...a/org/apache/gobblin/cluster/GobblinHelixTask.java	60.21% <0.00%> (-2.16%)	6.00% <0.00%> (ø%)
...a/management/copy/publisher/CopyDataPublisher.java	74.17% <0.00%> (-1.33%)	31.00% <0.00%> (-1.00%)
...main/java/org/apache/gobblin/yarn/YarnService.java	15.14% <0.00%> (+0.78%)	5.00% <0.00%> (+1.00%)
...in/java/org/apache/gobblin/cluster/HelixUtils.java	38.01% <0.00%> (+5.78%)	14.00% <0.00%> (+2.00%)
...lin/util/filesystem/FileSystemInstrumentation.java	100.00% <0.00%> (+7.14%)	4.00% <0.00%> (+1.00%)
...a/org/apache/gobblin/util/limiter/NoopLimiter.java	60.00% <0.00%> (+20.00%)	3.00% <0.00%> (+1.00%)

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