update mobile nav

docs/javascripts/header.js

docs/ms-nutzen.md

docs/overrides/partials/header.html

docs/overrides/partials/settings.html

docs/stylesheets/components/settings.css

docs/stylesheets/layout/grid.css

docs/stylesheets/layout/header.css

public/404.html

public/anl/index.html

public/coworking/index.html

public/danke/index.html

public/designlabor/index.html

public/digitallabor/index.html

public/dk/index.html

public/drittmittelprojekte/index.html

public/eb/index.html

public/feed_rss_created.xml

public/feed_rss_updated.xml

public/fkb/index.html

public/form/index.html