docs: Prepare for new sub tree

See #11925

docs/.markdownlint.yaml

@@ -1,25 +0,0 @@
-# https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md
-
-MD001: false
-MD002: false
-MD003: false
-MD004: false
-MD007: false
-MD012:
-  maximum: 2
-MD013: false
-MD014: false
-MD022: false
-MD024: false
-MD031: false
-MD032: false
-MD033: false
-MD034: false
-MD036: false
-MD037: false
-MD038: false
-MD041: false
-MD046: false
-MD049: false
-MD050: false
-MD053: false