feat: Mostly implemented routing using url-routing package.

Sources/App/Extensions/Request+extensions.swift

@@ -28,4 +28,16 @@ extension Request {
     let html = try await html()
     return HTMLResponse { html }
   }
+
+  // Render the html if we're an htmx request, otherwise render the main page.
+  func render<C: HTML, D: SendableHTMLDocument>(
+    mainPage: (C) async throws -> D,
+    @HTMLBuilder html: () async throws -> C
+  ) async rethrows -> HTMLResponse where C: Sendable {
+    let html = try await html()
+    guard isHtmxRequest else {
+      return try await render { try await mainPage(html) }
+    }
+    return HTMLResponse { html }
+  }
 }