Docs: Update agent/client setup

fixes #7254
Docs: Update Icinga Web 2 docs, clarify on the ui names (1.x)

fixes #7620
Docs: Fix remote client commands, formatting, missing attributes

refs #7254
Docs: Add missing init.conf
Update what's new (docs, changelog)

refs #7387
Fix: Names for nested objects are evaluated at the wrong time

fixes #7689
Native codegen (WIP)