Java SDK 4.0 Docs update

[maciejwalkowiak]

PR collecting all the changes in docs for Java SDK 4.0 containing the performance feature.

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🔍 Inspect: https://vercel.com/sentry/sentry-docs/pqe5yp3hi/sentry.dev
✅ Preview: https://sentry-docs-git-fork-maciejwalkowiak-gh-1151.sentry.dev

[maciejwalkowiak]

cc @bruno-garcia

[marandaneto]

Looks good, let's merge after releasing and iterate from there.

[maciejwalkowiak]

@marandaneto do you want to merge it after we release 4.0 Final, or after next alpha? If after 4.0 Final, I would also change here dependencies versions.

[marandaneto]

@marandaneto do you want to merge it after we release 4.0 Final, or after next alpha? If after 4.0 Final, I would also change here dependencies versions.

let's do it now, version is gonna be 4.0.0-beta.1

[maciejwalkowiak]

If we merge it now i believe official docs should link to latest stable..?

[marandaneto]

If we merge it now i believe official docs should link to latest stable..?

the question is if the current code snippets would work on the latest stable or not.
as every performance or new transport docs page require Sentry SDK v4, we'd need to link to v4 for those specific pages, I'd keep the latest version for everything else

[maciejwalkowiak]

To make our lives simpler, I changed versions everywhere to 4.0 and lets deploy docs once this is released.