change the base path to fix sub-paths on builds

vite.config.ts

@@ -4,7 +4,7 @@ import preact from '@preact/preset-vite';
 
 // https://vitejs.dev/config/
 export default defineConfig({
-    base: "",
+    base: "/",
     plugins: [
         // patchCssModules(),
         preact({ // I had to disable HMR due to un Vite bug (@see https://github.com/privatenumber/vite-css-modules)