[GOBBLIN-1354] Change homepage link in documentation for mkdocs build to pass on RTD

[abti]

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-1354

Description

• Here are some details about my PR, including screenshots (if applicable):
  Changing to apache url didnt work last time, so changing to index.md

Tests

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

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-io]

Codecov Report

Merging #3194 (d9398c4) into master (1b31c90) will increase coverage by 37.07%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #3194       +/-   ##
=============================================
+ Coverage      9.10%   46.18%   +37.07%     
- Complexity     1726     9769     +8043     
=============================================
  Files          2017     2017               
  Lines         77221    77221               
  Branches       8568     8568               
=============================================
+ Hits           7033    35662    +28629     
+ Misses        69500    38249    -31251     
- Partials        688     3310     +2622     

Impacted Files	Coverage Δ	Complexity Δ
.../org/apache/gobblin/writer/AvroHdfsDataWriter.java	77.77% <0.00%> (ø)	5.00% <0.00%> (+1.00%)
...gobblin/service/monitoring/JobStatusRetriever.java	0.00% <0.00%> (ø)	2.00% <0.00%> (+2.00%)
...main/java/org/apache/gobblin/util/HadoopUtils.java	30.59% <0.00%> (+0.65%)	25.00% <0.00%> (+1.00%)
...ata/management/copy/hive/HivePartitionFileSet.java	0.93% <0.00%> (+0.93%)	1.00% <0.00%> (+1.00%)
...ain/java/org/apache/gobblin/runtime/TaskState.java	81.97% <0.00%> (+1.16%)	32.00% <0.00%> (ø%)
...in/java/org/apache/gobblin/util/FileListUtils.java	71.42% <0.00%> (+1.29%)	28.00% <0.00%> (ø%)
...ava/org/apache/gobblin/runtime/MultiConverter.java	83.60% <0.00%> (+1.63%)	9.00% <0.00%> (+1.00%)
...rg/apache/gobblin/runtime/FsDatasetStateStore.java	73.80% <0.00%> (+1.78%)	35.00% <0.00%> (+1.00%)
.../org/apache/gobblin/cluster/GobblinTaskRunner.java	63.78% <0.00%> (+2.24%)	35.00% <0.00%> (+3.00%)
...org/apache/gobblin/yarn/GobblinYarnTaskRunner.java	2.70% <0.00%> (+2.70%)	1.00% <0.00%> (+1.00%)
... and 1061 more

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