Resolve "Update docs for v1.12"

Description

Update docs for v1.12.

Related issues/MRs

#206 (closed). Changes for !429 (merged), !433 (merged), !435 (merged), !443 (merged), !444 (merged), !446 (merged), !450 (merged), !453 (merged), !454 (merged), !455 (merged), !456 (merged), !458 (merged), !462 (merged), !463 (merged), !464 (merged), !465 (merged), !468 (merged), !469 (merged), !470 (merged), !473 (merged), !474 (merged), !475 (merged), !477 (merged), !478 (merged), !482 (merged), !483 (merged), !484 (merged)

Notes to review

Merge checklist

• Self-review of code performed
• Changes has been reviewed by other core developer. Apply label: code reviewdone

Closes #206 (closed)