feat: update dependencies and enhance privacy policy

Replace "@vercel/analytics" with "@tryghost/content-api" and add 
"node-fetch" to dependencies. Remove "@vercel/speed-insights" to 
streamline the package. Update robots.txt to dis access to 
"/legal-notice" and "/privacy-policy". Change <p> tags to <div> in 
the Privacy Policy for better structure. Update the last modified 
date in the Legal Notice. Add a new API route for fetching images 
with error handling for missing URL parameters.

public/robots.txt

@@ -1,3 +1,4 @@
 User-agent: *
 Allow: /
+Disallow: ['/legal-notice', '/privacy-policy']
 Sitemap: https://dki.one/sitemap.xml