feat: enhance custom modes documentation; add community modes discovery section

Author: hannesrudolph

docs/features/custom-modes.mdx

@@ -37,6 +37,10 @@ Roo Code allows you to create **custom modes** to tailor Roo's behavior to speci
 Each mode—including custom ones—features **Sticky Models**. This means Roo Code automatically remembers and selects the last model you used with a particular mode. This lets you assign different preferred models to different tasks without constant reconfiguration, as Roo switches between models when you change modes.
 :::
 
+:::info Discover Community Modes
+Looking for ready-to-use custom modes? Visit the [Roo Code Marketplace](/features/marketplace) to browse and install community-contributed modes with a single click. The marketplace offers specialized modes for various tasks like React development, documentation writing, testing, and more—all created and shared by the Roo Code community.
+:::
+
 ---
 
 ## Why Use Custom Modes?
@@ -661,5 +665,3 @@ In addition to mode-specific rules directories, there's also a generic `.roo/rul
 - **Invalid regex patterns:** If your `fileRegex` pattern is invalid, you'll receive an error message. Test your patterns using online regex testers before applying them.
 - **Precedence confusion:** Remember that project modes completely override global modes with the same slug - no properties are merged.
 
-## Community Resources
-Ready to explore more? Check out the [Community Projects](/community) page to discover tools and projects that extend Roo Code's capabilities, including sophisticated custom mode collections like [Roo Commander](/community/roo-commander) and [Maestro](/community/maestro).