De-vendorize the docs project

• "add-services/*" - #3761
• "administration/*" - #3771
• "changelog/*" - #3769
• "create-apps/*" - #3778
• "dedicated-gen-2/*" - already ignored
• "dedicated-gen-3/*" - already ignored
• "define-routes/" - #3748
• "development/*" - #3786
• "domains/*" - #3770
• "environments/*" - #3749
• "feedback/*" - #3768
• "get-started/*" - already ignored
• "glossary/*" - already ignored
• "guides/*" - already ignored
• "increase-observability/*" - #3767
• "integrations/*" - #3755
• "languages/*" - #3760
• "learn/*" - #3746
• "projects/*" - #3739
• "registry/*" - already ignored
• "security/*" - already ignored