Turn into vuepress with static "service unavailable" page to redirect hydrogen and API
- Turn into vuepress (vitepress?*)
- Host on nucleus.noc.ac.uk root domain
- Create static "service unavailable page"
- Change nginx config to switch service off easily and redirect to 503 page
*There's currently no vitepress equivalent of vuepress-theme-vuetify - seems like it makes sense to keep this with vuepress like the others.