build(pre-commit): Add markdownlint

.markdownlint.yaml

@@ -0,0 +1,16 @@
+# Default state for all rules.
+default: true
+
+# MD024/no-duplicate-heading/no-duplicate-header - Multiple headings with the same content.
+MD024:
+  # Only check sibling headings.
+  siblings_only: true
+
+# MD013/line-length: Line length.
+MD013: false
+
+# MD041/first-line-heading/first-line-h1: First line in a file should be a top-level heading.
+MD041: false
+
+# MD040/fenced-code-language Fenced code blocks should have a language specified
+MD040: false

.pre-commit-config.yaml

@@ -33,6 +33,11 @@ repos:
       - id: mdformat
         args: [--wrap=80]
 
+  - repo: https://github.com/DavidAnson/markdownlint-cli2
+    rev: v0.6.0
+    hooks:
+      - id: markdownlint-cli2
+
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v3.0.0-alpha.6
     hooks:

devel/pre-commit.md

@@ -22,11 +22,11 @@ Pre-commit is configured via
 ## GitHub Actions
 
 While pre-commit is used in GitHub Actions, there is no explicit job or workflow
-where pre-commit is executed. This happens through https://pre-commit.ci a
+where pre-commit is executed. This happens through <https://pre-commit.ci> a
 GitHub App called [pre-commit ci](https://github.com/marketplace/pre-commit-ci).
 
 Configuration for this is done in the repository owner's settings and the
-https://pre-commit.ci web user interface.
+<https://pre-commit.ci> web user interface.
 
 ## Housekeeping