Remove test file

rules/lowercase_keys.json

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+{
+  "name": "lowercase_keys",
+  "description": "All frontmatter keys must be lowercase",
+  "type": "keys"
+}

rules/summary_to_description.json

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+{
+  "name": "summary_to_description",
+  "description": "Rename 'summary' key to 'description'",
+  "type": "rename"
+}

rules/tag_to_tags.json

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+{
+  "name": "tag_to_tags",
+  "description": "Rename 'tag' key to 'tags'",
+  "type": "rename"
+}

rules/tags_normalization.json

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+{
+  "name": "tags_normalization",
+  "description": "Normalize tags to lowercase with underscores",
+  "type": "tags"
+}