Added simple MD support for sidenote content

pnpm-lock.yaml

@@ -20,6 +20,9 @@ importers:
       '@markdoc/markdoc':
         specifier: ^0.5.4
         version: 0.5.4(@types/react@19.1.13)(react@19.1.0)
+      marked:
+        specifier: ^16.3.0
+        version: 16.3.0
       next:
         specifier: 15.5.3
         version: 15.5.3(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
@@ -2928,6 +2931,11 @@ packages:
   markdown-table@3.0.4:
     resolution: {integrity: sha512-wiYz4+JrLyb/DqW2hkFJxP7Vd7JuTDm77fvbM8VfEQdmSMqcImWeeRbHwZjBjIFki/VaMK2BhFi7oUUZeM5bqw==}
 
+  marked@16.3.0:
+    resolution: {integrity: sha512-K3UxuKu6l6bmA5FUwYho8CfJBlsUWAooKtdGgMcERSpF7gcBUrCGsLH7wDaaNOzwq18JzSUDyoEb/YsrqMac3w==}
+    engines: {node: '>= 20'}
+    hasBin: true
+
   match-sorter@6.3.4:
     resolution: {integrity: sha512-jfZW7cWS5y/1xswZo8VBOdudUiSd9nifYRWphc9M5D/ee4w4AoXLgBEdRbgVaxbMuagBPeUC5y2Hi8DO6o9aDg==}
 
@@ -7830,6 +7838,8 @@ snapshots:
 
   markdown-table@3.0.4: {}
 
+  marked@16.3.0: {}
+
   match-sorter@6.3.4:
     dependencies:
       '@babel/runtime': 7.28.4