impl: Create folders if they don't exist

src/files.py

@@ -97,7 +97,8 @@ class DocumentTree():
     def document_write(self, path: str, text: str) -> None:
         internal_path = os.path.join(self.base, *path.split('/')) + '.md'
 
-        # TODO: Check if the directory exists before writing
+        # TODO: Probably add some sort of confirmation beforehand?
+        os.makedirs(os.path.dirname(internal_path))
         with open(internal_path, 'w') as file:
             file.write(text)