All Access-Control-Allow-Origin are removed to improve users' privacy. As
the status page API is thus not useful without the status page anymore,
merge them back into a single package.
The status-page-api respondd provider is removed as well.
Fixes#1194
This new status page is significantly smaller than the old one. It always
loads its resources from the same host as the page itself, not requiring
cross-origin requests anymore.
It also uses the common i18n infrastructure of gluon-web.
Fixes#914