update rules

Author: nstepien

eslint.config.js

@@ -1105,17 +1105,36 @@ copy(
     plugins: {
       markdown
     },
-    language: 'markdown/commonmark',
+    language: 'markdown/gfm',
     rules: {
+      // `@eslint/markdown` rules
+      // https://github.com/eslint/markdown/blob/main/README.md#rules
+      /*
+// copy all the rules from the rules table for easy pasting
+copy(
+  Iterator.from(
+    document
+      // select rules table
+      .querySelector('.markdown-heading:has(> a[href="#rules"]) ~ markdown-accessiblity-table tbody')
+      // select all rule links
+      .querySelectorAll(':any-link')
+  )
+    // map link to rule declaration
+    .map((link) => `'markdown/${link.textContent}': 1,`)
+    .toArray()
+    .join('\n')
+);
+      */
       'markdown/fenced-code-language': 1,
+      'markdown/fenced-code-meta': 0,
       'markdown/heading-increment': 1,
       'markdown/no-bare-urls': 1,
       'markdown/no-duplicate-definitions': 1,
-      'markdown/no-duplicate-headings': 0,
+      'markdown/no-duplicate-headings': [1, { checkSiblingsOnly: true }],
       'markdown/no-empty-definitions': 1,
       'markdown/no-empty-images': 1,
       'markdown/no-empty-links': 1,
-      'markdown/no-html': 0,
+      'markdown/no-html': [1, { allowed: ['br', 'kbd'] }],
       'markdown/no-invalid-label-refs': 1,
       'markdown/no-missing-atx-heading-space': 1,
       'markdown/no-missing-label-refs': 1,