Add discussion link

src/theme/MDXComponents.js

@@ -0,0 +1,13 @@
+import React from 'react';
+// Import the original mapper
+import MDXComponents from '@theme-original/MDXComponents';
+//Import custom component
+import BlogDiscussions from '@site/src/components/BlogDiscussions';
+
+export default {
+    // Re-use the default mapping
+    ...MDXComponents,
+    // Map the "<BlogDiscussions>" tag to our BlogDiscussions component
+    // `BlogDiscussions` will receive all props that were passed to `<BlogDiscussions>` in MDX
+    BlogDiscussions,
+};