test: mdx validation

Author: kesku

.github/workflows/pr-validation.yml

@@ -8,7 +8,7 @@ on:
       - '.github/workflows/**'
 
 jobs:
-  validate-mdx:
+  mdx-validation:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo

docs/test-validation.mdx

@@ -0,0 +1,21 @@
+---
+title: Test Validation
+description: Testing MDX validation
+---
+
+## Unclosed tag
+<div>
+This div is not closed
+
+## Unescaped brackets
+Here's a URL: https://<project>.supabase.co 
+
+# Heading
+
+## Subheading
+
+### Subsubheading
+
+#### Subsubsubheading
+
+##### Subsubsubsubheading