chore: Updated many pages to use 'site:' links instead of relative links, for pages that have moved in this change

chore: Update site page structuring in howtos & other diataxis areas so directories reflect navigation structuring for easier management & much smaller doc directory sizes

feat: Alphabetise & neaten extensions in mkdocs.base.yml, add stylesheets for neoteroi cards and diataxis related styling

feat: Add new macro tabbed_services_view to generate content tabs view of all...

See merge request !449

chore: Updated renovatebot & user-notify pages and references after relocation from docs/services/ dir