Add Formbricks configuration to environment files and update package dependencies

- Introduced new environment variables for Formbricks in .env.backup and .env.example.
- Updated package.json and yarn.lock to include React and related types for improved functionality.
- Added new favicon images and manifest for better branding and user experience.
- Implemented new Svelte components for enhanced content management, including Badge, Card, OrganisationsBlock, and OpnFormBlock.
- Updated ContentRows component to support new block types.

src/env.d.ts

@@ -4,6 +4,10 @@ interface ImportMetaEnv {
   readonly PUBLIC_CMS_URL: string;
   readonly PUBLIC_UMAMI_SCRIPT_URL?: string;
   readonly PUBLIC_UMAMI_WEBSITE_ID?: string;
+  /** Formbricks-Instanz (ohne trailing slash), z. B. https://forms.pm86.de */
+  readonly PUBLIC_FORMBRICKS_APP_URL?: string;
+  /** Formbricks Environment ID (Setup Checklist) */
+  readonly PUBLIC_FORMBRICKS_ENVIRONMENT_ID?: string;
 }
 
 interface ImportMeta {