Add Flags Assets and Update Configuration

- Introduced multiple SVG flag assets to the project, enhancing the visual representation of country flags.
- Updated the configuration file to include a new path for the flags assets, ensuring proper access and organization.
- Modified the main application to accommodate the new flags path, improving the overall asset management in the application.

cmd/web/assets/flags/bj.svg

@@ -0,0 +1,14 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="flag-icons-bj" viewBox="0 0 640 480">
+  <defs>
+    <clipPath id="bj-a">
+      <path fill="gray" d="M67.6-154h666v666h-666z"/>
+    </clipPath>
+  </defs>
+  <g clip-path="url(#bj-a)" transform="matrix(.961 0 0 .7207 -65 111)">
+    <g fill-rule="evenodd" stroke-width="1pt">
+      <path fill="#319400" d="M0-154h333v666H0z"/>
+      <path fill="#ffd600" d="M333-154h666v333H333z"/>
+      <path fill="#de2110" d="M333 179h666v333H333z"/>
+    </g>
+  </g>
+</svg>