Add 404 page (#8)

* Add postbuild script to copy 404.html

using index.html

* Revert route for home in app

Author: shaunmolloy

web/package.json

@@ -5,6 +5,7 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc -b && vite build",
+    "postbuild": "cp dist/index.html dist/404.html",
     "lint": "eslint .",
     "preview": "vite preview"
   },

web/src/App.tsx

@@ -8,8 +8,8 @@ function App() {
     <div className="page">
       <main className="content">
         <Routes>
+          <Route path="/" element={<Home />} />
           <Route path="/posts/:slug" element={<Post />} />
-          <Route path="*" element={<Home />} />
         </Routes>
       </main>
     </div>