Move java sdk configuration documentation into docs site

[jaydeluca]

Contributes to:

• java/automatic/configuration links out to pages that should be moved to docs #4032

A few notes:

• Instead of listing both the system properties and environment variables, I just added the env vars. If the system properties would be preferred or if we think there's value in both, let me know and I can update. Other languages seemed to reference env vars so thats why I chose that one, but a lot of the rest of the existing doc used the system properties.
• I left links out to Batch span processor, Span limits, and Using the SPI to further configure the SDK since I didn't see similar sections in other languages, but let me know if we want all of them ported over and I can do those as well
• I defaulted to including every config option for each category that I moved over, but if there are things that make sense to just leave documented in the SDK repo vs here, let me know and I can drop them

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Preview: https://deploy-preview-4377--opentelemetry.netlify.app/docs/languages/java/automatic/configuration/#resources

[theletterf]

Great work! First pass review follows.

[theletterf]

@open-telemetry/java-instrumentation-maintainers PTAL

[chalin]

One minor drive-by comment regarding use of a "real" (bidirectionally linked) footnote.

[jaydeluca]

One minor drive-by comment regarding use of a "real" (bidirectionally linked) footnote.

@chalin I looked around for a pattern to follow for footnotes to ensure consistency and landed on mirroring the Next Steps sections from other pages. If this is not what you were suggesting, please let me know. If this is what you meant, then I can followup with a similar PR to the SDK repo to add a link to the doc site as well.

[svrnm]

@open-telemetry/java-approvers @open-telemetry/java-instrumentation-approvers PTAL!

[chalin]

Hi @jaydeluca - I've edited the opening comment to indicate that this PR contributes to #4032. We should only close #4032 once the corresponding pieces are removed from that file (I don't know if the entire file is covered here and will therefore be removed, or have a link added to this page). WDYT?