Update link to config file

.github/workflows/validate_markdown.yml

@@ -25,19 +25,7 @@ jobs:
       with:
     #    globs: ${{ steps.changed-files.outputs.all_changed_files }}
     #    separator: ","
-        config: '.rules/custom.markdownlint.jsonc'
-
-  markdown-lint-detailed:
-    runs-on: ubuntu-latest
-    needs:
-      - markdown-lint-quick
-    steps:
-    - name: Check out code
-      uses: actions/checkout@v4.1.0
-
-    # https://github.com/actionshub/markdownlint
-    - name: Markdown Lint
-      uses: actionshub/markdownlint@main
+        config: '.rules/.markdownlint.jsonc'
 
   markdown-links:
     runs-on: ubuntu-latest