Rewrite documentation homepage

[mssalvatore]

What does this PR do?

Rewrites the documentation homepage to be harmonious with the project's README.md

PR Checklist

• [ ] Have you added an explanation of what your changes do and why you'd like to include them?
• [ ] Is the TravisCI build passing?
• [ ] Was the CHANGELOG.md updated to reflect the changes?
• [ ] Was the documentation framework updated to reflect the changes?
• [ ] Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• [ ] Added relevant unit tests?
• [ ] Do all unit tests pass?
• [ ] Do all end-to-end tests pass?
• [ ] Any other testing performed?

  Tested by {Running the Monkey locally with relevant config/running Island/...}

• [ ] If applicable, add screenshots or log transcripts of the feature working

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.06%. Comparing base (ea5bc55) to head (6b43a76). Report is 6 commits behind head on develop.

:exclamation: Current head 6b43a76 differs from pull request most recent head 584ac98

Please upload reports for the commit 584ac98 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4193 +/- ## ======================================== Coverage 77.06% 77.06% ======================================== Files 442 442 Lines 14126 14126 Branches 18 18 ======================================== Hits 10886 10886 Misses 3240 3240 ```

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