Camunda 7.12 docs are released

Before the new Platform version is released, the documentation needs to be updated.
See Phase 2 and Phase 3 in the Release guide. This includes:

Phase 2 (days before Release day)
[  ] Stage new version of the docs
[  ] Create docs stage and release jobs for new branch (SRE)
[  ] Adjust docs with new version
[  ] Stage Enterprise Download Page (*, QA)
[  ] Stage Community Download Page

Phase 3 (on Release day)
[  ] Release Jira (TL, EM)
[  ] Forward Security Reports (TL, EM)
[  ] Release Maven Central
[  ] Release Javadocs
[  ] Release the Staged Docs
[  ] Push Redirects / URL rewrites adjustments
[  ] Adjust Google Custom Search Engine (PM)
[  ] Release the Getting Started
[  ] Release the Enterprise Download Page
[  ] Release the Community Download Page
[  ] Release the Blog Post
[  ] Publish the release on Twitter (MKT + PM)
[  ] Send Mailings (SUP)
[  ] Make a Forum Announcement