Add metrics usage guide for IAM Proxy 4.8.0

Add comprehensive healthcheck configuration guide v2.0

Add full project documentation and manual

Add one-page AI learning website to test/onepage

Remove files outside docs/ directory

Add Documentation release 4.4.1 to docs/4.4.1

Add Documentation release 4.8.0 to docs/4.8.0

Merge branch 'main' of https://github.com/alekseylylov/PVIAM