docs: Update dead Context7 mcp server link (#4207)

Co-authored-by: Corwin Marsh <[email protected]>

packages/web/src/content/docs/mcp-servers.mdx

@@ -256,7 +256,7 @@ Below are examples of some common MCP servers. You can submit a PR if you want t
 
 ### Context7
 
-Add the [Context7 MCP server](https://github.com/context-labs/mcp-server-context7) to search through docs.
+Add the [Context7 MCP server](https://github.com/upstash/context7) to search through docs.
 
 ```json title="opencode.json" {4-7}
 {