docs: align v2.1.1 Wiki guidance and companion footer
docs: align Wiki with published v2.1.1 Keep the two latest release summaries on Home and retain older history links and anchors. Align current upgrade, revision-13, mapping and HACS discovery guidance with the published source. Validation: all 21 Wiki pages reviewed; local and canonical links resolve; version governance, Bella coherence and dedicated code review pass. Runtime and assets are unchanged.
docs: align manual with v2.1.1 Stable release Use finished release and upgrade guidance, retain v2.1.0 and RC history, and keep HACS provider evidence separate from loaded identity. Reviewed by Bella and dedicated code review; 150 local links resolve.
docs: align Wiki with v2.1.1 Stable preparation Add final-version upgrade guidance and retain the RC guide as history. Keep published v2.1.0 identity, revision-13 compatibility, diagnostics and HACS evidence boundaries aligned with the reviewed Stable source. Validation: independent House and code review; 95 local Wiki links checked; final source and surface snapshot hashes verified; git diff --check passed.