Merge branch 'docs/cells-routing-tech' into 'master'

Use Cloudflare Workers for Cell routing

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142391



Merged-by: Thong Kuah <tkuah@gitlab.com>
Approved-by: Thong Kuah <tkuah@gitlab.com>
Approved-by: Kamil Trzciński <ayufan@ayufan.eu>
Reviewed-by: Kamil Trzciński <ayufan@ayufan.eu>
Co-authored-by: Steve Xuereb <sxuereb@gitlab.com>