All deployments

Implement sitemap generation and add a route for sitemap.xml to enhance
SEO and improve site indexing.

Change sitemap URL to remove the .gz extension for proper indexing.

Implement sitemap generation with customizable options for priority and
change frequency. Remove old sitemap files and add a new XML sitemap.

Integrate sitemap generator and update robots.txt to include sitemap URL.

Display the message about the "Life in weeks" feature only if the birth date is not set.