fix: move import statement after frontmatter in codebase-indexing.mdx (#256)

Co-authored-by: Hannes Rudolph <[email protected]>

Author: roomote[bot]

docs/features/codebase-indexing.mdx

@@ -1,5 +1,3 @@
-import Codicon from '@site/src/components/Codicon';
-
 ---
 description: Learn how Codebase Indexing helps Roo Code understand large projects using AI embeddings and semantic search. Setup guide for OpenAI and Qdrant integration.
 keywords:
@@ -13,6 +11,8 @@ keywords:
 image: /img/social-share.jpg
 ---
 
+import Codicon from '@site/src/components/Codicon';
+
 # Codebase Indexing
 
 Codebase Indexing transforms how Roo Code understands your project by creating a semantic search index using AI embeddings. Instead of searching for exact text matches, it understands the *meaning* of your queries, helping Roo find relevant code even when you don't know specific function names or file locations.