Remove outdated usage of "Consul Connect" instead of Consul service mesh.
The connect subsystem in Consul provides Consul's service mesh capabilities.
However, the term "Consul Connect" should not be used as an alternative to
the name "Consul service mesh".
* Fix broken links in Consul docs
* more broken link fixes
* more 404 fixes
* 404 fixes
* broken link fix
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Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>