CORS content review

[MichalMaler]

Creating this PR to separate pure CORS content from the already opened PR that mix the same changes as this PR with some other fixes that got into my cross hair.

This is the docs team follow-up of the @sberyozkin 's PR https://github.com/quarkusio/quarkus/pull/36541/files

This PR already contains SME review of @sberyozkin and @jmartisk .

[sberyozkin]

Thanks @MichalMaler, @jmartisk, sorry for the hassle with having it opened in a dedicated PR, but hope you'll find it easier to deal with various backport requirements later

[MichalMaler]

Thanks @MichalMaler, @jmartisk, sorry for the hassle with having it opened in a dedicated PR, but hope you'll find it easier to deal with various backport requirements later

Cool. No worries. Please attach the needed labels and feel free to merge :)

[MichalMaler]

@rsvoboda Hello Rostislav! Do we want this PR to be backported to 3.2?
Cheers.

[github-actions]

🎊 PR Preview ee1d5a3 has been successfully built and deployed to https://quarkus-pr-main-36667-preview.surge.sh/version/main/guides/

[rsvoboda]

PR looks good to me, thanks @MichalMaler

@sberyozkin there are quite a few changes going on around security guides, they should be probably marked for backport to 3.2 because security guides are planned for downstream. WDYT?

Or we can process what's available in 3.2 branch and pick the current (and future) changes in the next feature release.