Reference configuration documentation on opentelemetry.io

[jaydeluca]

Context

Contributes to open-telemetry/opentelemetry.io#4032

Related to open-telemetry/opentelemetry.io#4032

The information in the autoconfigure module readme has been moved to the documentation site:
https://opentelemetry.io/docs/languages/java/configuration/

Change

• Removed the redundant documentation to make opentelemetry.io the source of truth.
• Updated the autoconfigure module readme to reference the new location.
• Added a note in the contribution guide about keeping that documentation location up to date.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.63%. Comparing base (788347e) to head (e1f82ef).
Report is 24 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6491      +/-   ##
============================================
- Coverage     90.87%   90.63%   -0.24%     
- Complexity     6156     6226      +70     
============================================
  Files           675      678       +3     
  Lines         18461    18659     +198     
  Branches       1813     1842      +29     
============================================
+ Hits          16776    16912     +136     
- Misses         1149     1189      +40     
- Partials        536      558      +22     

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