chore: update markdownlintignore and pre-commit config

Add `.github/` to `.markdownlintignore` to exclude GitHub-specific
files from markdown linting, as they are not relevant for content
validation.

Integrate `markdownlint` into the pre-commit configuration to ensure
consistent markdown style and formatting across the project. This
addition helps maintain code quality and readability by automatically
checking markdown files before commits.

Author: kzndotsh

.markdownlintignore

@@ -27,3 +27,5 @@ logs/
 # Exclude dependencies and generated files
 prisma/
 typings/
+
+.github/

.pre-commit-config.yaml

@@ -31,6 +31,10 @@ repos:
     rev: v1.7.7
     hooks:
       - id: actionlint
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.45.0
+    hooks:
+      - id: markdownlint
   - repo: https://github.com/asottile/pyupgrade
     rev: v3.20.0
     hooks: