update ms-nutzen + mobile nav

docs/javascripts/header.js

docs/ms-nutzen.md

docs/news/24-08-07_aenderungen.md

docs/stylesheets/components/contact-form.css

docs/stylesheets/layout/grid.css

docs/stylesheets/layout/header.css

public/feed_rss_created.xml

public/feed_rss_updated.xml

public/javascripts/header.js

public/ms-nutzen/index.html

public/news/24-08-07_aenderungen/index.html

public/news/index.html

public/sitemap.xml

public/sitemap.xml.gz

public/stylesheets/components/contact-form.css

public/stylesheets/layout/grid.css

public/stylesheets/layout/header.css