Fix code block syntax highlighting in files.md and remove unused hero image in markdown-include.md

Author: pelikhan

docs/src/content/docs/reference/scripts/files.md

@@ -259,7 +259,7 @@ await workspace.writeText(".env", "SECRET=value");
 
 The `fs_write_file` system tool provides LLMs with controlled file writing capabilities:
 
-```genai
+```js
 script({
   title: "Safe file operations",
   system: ["fs_write_file"]

docs/src/content/docs/reference/scripts/markdown-include.md

@@ -4,10 +4,6 @@ sidebar:
   order: 51
 description: Learn how to include external files in markdown scripts using the @include directive
 keywords: markdown scripts, include, file inclusion, @include directive
-hero:
-  image:
-    alt: A minimalistic 8-bit style icon showing two document rectangles with arrows pointing from one to another, representing file inclusion. The first document has an "@include" symbol, and content flows to the second document. Small geometric shapes indicate text content. The image uses five corporate colors on a transparent background, is highly simplified and geometric, and measures 128 by 128 pixels. No people, words, or realistic effects are present.
-    file: ./markdown-include.png
 
 ---