This commit introduces significant SEO improvements and enhances content embedding capabilities.
- Integrates `@nuxtjs/seo`, `@nuxtjs/sitemap`, and `@nuxtjs/robots` to boost search engine visibility.
- Configures global meta tags, including Open Graph and Twitter Cards, for richer social media sharing.
- Adds support for embedding YouTube and Facebook content directly within markdown pages.
- Introduces a new `TikTokEmbed` component for future use.
