docs: refresh homepage and prune navigation

Rework the site homepage to emphasize the fast in-memory codebase index
(beyond the AST), tree-sitter backing, an inline dead-code deletion
example, the uvx command pattern, and coding-agent use cases.

Prune navigation: remove MCP/documentation/code-research/neo4j tutorials,
drop advanced-settings/community/ide-usage/AI+LLM integration intro pages,
delete the broken use-cases/organizations/users sections, focus
installation on uvx, pin Overview to the top of Introduction, and fix the
resulting dead links.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: jayhack

docs/building-with-graph-sitter/at-a-glance.mdx

@@ -126,13 +126,6 @@ Learn how to use Codegen's core APIs to analyze and transform code.
   >
     Analyze and manipulate local variable usage and scope.
   </Card>
-  <Card
-    title="Calling Out to LLMs"
-    icon="robot"
-    href="/building-with-graph-sitter/calling-out-to-llms"
-  >
-    Integrate AI assistance into your code transformations.
-  </Card>
   <Card
     title="Codebase Visualization"
     icon="chart-network"

docs/building-with-graph-sitter/calling-out-to-llms.mdx

@@ -71,5 +71,5 @@ If you plan on using Codegen's MCP (Model Context Protocol) or LSP (Language Ser
 For any additional issues, see the [troubleshooting guide](/introduction/installation#troubleshooting).
 
 <Note>
-For more help, join our [community Slack](/introduction/community) or check the [FAQ](/introduction/faq).
+For more help, check the [FAQ](/introduction/faq).
 </Note>

docs/building-with-graph-sitter/codegen-with-wsl.mdx

@@ -185,12 +185,6 @@ new_docstring = codebase.ai(
 function.set_docstring(new_docstring)
 ```
 
-<Tip>
-  Learn more about AI documentation capabilities in our [Documentation
-  Guide](/tutorials/creating-documentation) and [LLM Integration
-  Guide](/building-with-graph-sitter/calling-out-to-llms).
-</Tip>
-
 ### Documentation Coverage
 
 You can analyze and improve documentation coverage across your codebase:
@@ -206,9 +200,4 @@ for function in codebase.functions:
 
 coverage = (documented / total * 100) if total > 0 else 0
 print(f"Documentation coverage: {coverage:.1f}%")
-```
-
-<Note>
-  Check out the [Documentation Guide](/tutorials/creating-documentation) for
-  more advanced coverage analysis and bulk documentation generation.
-</Note>
+```

docs/building-with-graph-sitter/comments-and-docstrings.mdx

@@ -42,7 +42,7 @@ gs create rename-function . -d "Rename the getUserData function to fetchUserProf
 
 This will:
 1. Generate an implementation based on your description
-2. Create a custom system prompt that you can provide to an IDE chat assistant (learn more about [working with AI](/introduction/work-with-ai))
+2. Create a custom system prompt that you can provide to an IDE chat assistant
 3. Place both files in the codemod directory
 
 ## Running Codemods

docs/building-with-graph-sitter/reusable-codemods.mdx

@@ -40,7 +40,7 @@ We believe in the power of open source software. Our core library, [codegen](htt
   <Card title="Careers" icon="briefcase" href="https://codegen.com/careers">
     We're hiring! Join us in building the future of code transformation.
   </Card>
-  <Card title="Community" icon="people-group" href="/introduction/community">
+  <Card title="GitHub" icon="github" href="https://github.com/codegen-sh/graph-sitter">
     Connect with other developers and share your Graph-sitter experiences.
   </Card>
 </CardGroup>