fix: add null checks to parsers and fix docs path

src/lib/parser.ts

@@ -8,6 +8,10 @@ const HR_REGEX = /^---+$/
 const REFERENCE_REGEX = /@see\s+([^\s]+)/g
 
 export function parseMarkdown(content: string): ParsedDoc {
+  if (!content || typeof content !== 'string') {
+    return { title: '', metadata: {}, sections: [], references: [] };
+  }
+  
   const lines = content.split('\n')
   const result: ParsedDoc = {
     title: '',