chore(config): update speaches config and ignore sveltekit dashboard

- Simplified .env.example to use localhost SPEACHES_URL
- Removed unused prod_url from SpeachesSettings config
- Added dashboard node_modules and build dirs to .gitignore
- Streamlines local development setup

dashboard/vite.config.ts

@@ -0,0 +1,13 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import tailwindcss from '@tailwindcss/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+	plugins: [sveltekit(), tailwindcss()],
+	server: {
+		proxy: {
+			'/api': 'http://localhost:8000',
+			'/ws': { target: 'ws://localhost:8000', ws: true },
+		},
+	},
+});