fix(ci): use markdown lint action

.gitea/workflows/markdown-linters.yaml

@@ -0,0 +1,22 @@
+name: 'Lint Markdown files'
+
+on:
+  pull_request:
+    types:
+    - opened
+    - reopened
+    - synchronize
+  push:
+    branches:
+    - master
+  workflow_dispatch: {}
+
+jobs:
+  markdown-lint:
+    runs-on:
+    - ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4.2.2
+    - uses: DavidAnson/markdownlint-cli2-action@v19.1.0
+      with:
+        globs: '**/*.md'