fix: remove all the keys

Author: RigelNana

src/content/docs/cpp/language/basics.mdx

@@ -2,8 +2,6 @@
 title: Overview
 sidebar:
   order: 1
-cppdoc:
-  keys: ["cpp.lang.basic"]
 ---
 
 import { Revision } from "@components/revision";

src/content/docs/cpp/language/comments.mdx

@@ -1,8 +1,6 @@
 ---
 title: Comments
 description: Auto‑generated from cppreference
-cppdoc:
-  keys: ["cpp.lang.comments"]
 ---
 
 import { Desc, DescList, DocLink } from '@components/index';

src/content/docs/cpp/language/exceptions.mdx

@@ -1,7 +1,5 @@
 ---
 title: Exceptions
-cppdoc:
-  keys: ["cpp.lang.exceptions"]
 ---
 
 import { Decl, DeclDoc } from "@components/decl-doc";

src/content/docs/cpp/language/main_function.mdx

@@ -1,7 +1,5 @@
 ---
 title: Main function
-cppdoc:
-  keys: ["cpp.lang.main"]
 ---
 
 import Code from "@astrojs/starlight/components";

src/content/docs/cpp/language/preprocessor.mdx

@@ -1,7 +1,5 @@
 ---
 title: Preprocessor
-cppdoc:
-  keys: ["cpp.lang.preprocessor"]
 ---
 
 import { Desc, DescList, DocLink } from '@components/index';

src/content/docs/cpp/language/templates.mdx

@@ -1,7 +1,5 @@
 ---
 title: Templates
-cppdoc:
-  keys: ["cpp.lang.templates"]
 ---
 
 import { Decl, DeclDoc } from "@components/decl-doc";

src/content/docs/cpp/library/index.mdx

@@ -2,8 +2,6 @@
 title: Overview
 sidebar:
   order: 1
-cppdoc:
-  keys: ["cpp.library"]
 ---
 
 import { Card } from "@astrojs/starlight/components";

src/content/docs/cpp/library/utilities/move.mdx

@@ -1,7 +1,6 @@
 ---
 title: std::move
 cppdoc:
-  keys: ["cpp.library.utilities.move"]
   revision:
     since: C++11
 ---