Integrate svelte-preprocess into Svelte configuration and update metadata for improved build process. Remove unused Lottie player and related dependencies to streamline project structure.

svelte.config.js

@@ -1,5 +1,8 @@
+import sveltePreprocess from 'svelte-preprocess';
+
 /** @type {import('@sveltejs/vite-plugin-svelte').Options} */
 const config = {
+  preprocess: sveltePreprocess(),
   compilerOptions: {
     css: 'injected'
   }