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/composables/useMarkdown.js

@@ -0,0 +1,15 @@
+import { marked } from 'marked'
+
+export const useMarkdown = () => {
+  const render = (markdown) => {
+    if (!markdown) return ''
+    return marked(markdown, {
+      breaks: true,
+      gfm: true
+    })
+  }
+
+  return {
+    render
+  }
+}