docs: add banner

[tayloramurphy]

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📚 Documentation preview 📚: https://meltano-sdk--1763.org.readthedocs.build/en/1763/

[codecov]

Codecov Report

Merging #1763 (cc7f40f) into main (bd1a425) will not change coverage.
The diff coverage is n/a.

❗ Current head cc7f40f differs from pull request most recent head 1d744c7. Consider uploading reports for the commit 1d744c7 to get more accurate results

@@           Coverage Diff           @@
##             main    #1763   +/-   ##
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  Coverage   85.93%   85.93%           
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  Files          59       59           
  Lines        4942     4942           
  Branches      809      809           
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  Hits         4247     4247           
  Misses        492      492           
  Partials      203      203           

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[tayloramurphy]

@sbalnojan can you take this PR and update the colors / copy to what you want? We can add this to the EDK docs too.

[sbalnojan]

@tayloramurphy I just exchanged the text (see deploy preview), but the link doesn't work. Any idea why?