Add Markdown support and update member features

The commit adds Markdown rendering capabilities and makes several UI/UX
improvements across member-related features including profile display,
peer support badges, and navigation structure.

Includes:
- Added @tailwindcss/typography plugin
- New Markdown rendering composable
- Simplified member navigation links
- Enhanced member profile layout and styling
- Added peer support badge component
- Improved mobile responsiveness
- Removed redundant icons and simplified UI

app/assets/css/main.css

@@ -2,6 +2,8 @@
 @import "tailwindcss";
 @import "@nuxt/ui";
 
+@plugin "@tailwindcss/typography";
+
 @theme {
   /* Font families */
   --font-sans: "Inter", sans-serif;