feat(content): add How It Works page with markdown support

- Create HowItWorksPage component with markdown rendering
- Add how-it-works.md with Lorem Ipsum placeholder content
- Add /how-it-works route in App.jsx
- Add How It Works link to homepage footer (Product section)

frontend/src/pages/HomePage.jsx

@@ -263,6 +263,11 @@ const HomePage = () => {
             <div>
               <h3 className="text-white font-semibold mb-4">Product</h3>
               <ul className="space-y-2 text-sm">
+                <li>
+                  <Link to="/how-it-works" className="hover:text-primary-400 transition">
+                    How It Works
+                  </Link>
+                </li>
                 <li>
                   <Link to="/events" className="hover:text-primary-400 transition">
                     Events