chore: replace old URLs of the repo with the new docs

[victorelec14]

I updated the old links to the repository documentation that were changed in PR #3307 (Issue #1996 )

I set the link to the Sentry domain as I saw in other parts of the application. If necessary, I can change them to the links from the MK file in the repository.

https://github.com/getsentry/sentry-docs/blob/master/develop-docs/self-hosted/index.mdx#enhance-sentry-image

Thank you.

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.02%. Comparing base (cba2d4b) to head (2239ade).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3375      +/-   ##
==========================================
- Coverage   99.01%   98.02%   -0.99%     
==========================================
  Files           3        3              
  Lines         203      203              
==========================================
- Hits          201      199       -2     
- Misses          2        4       +2     

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[BYK]

For some reason the docs page lands me on the "productionalizing" section but it's not the fault of this change.

Thanks so much for doing this!

[hubertdeng123]

Great find!