We don't require npm to be installed

The old version is no longer maintained and doesn't support rollup v3

In case the current language changes or the current activity is re-selected in the
menu we don't want to lose the extra trailing path components.

Centralize the server config in one place, so it can easily be changed in one
file for all package demos.

This just adds it for the app-shell, for starters.

It got moved to https://gitlab.tugraz.at/dbp/web-components/tugraz-components/-/tree/main/packages/web-components

All apps have been ported to use that package instead.

otherwise it pulls it in from npm

Add another fix to nextcloud. if file is already on the nextcloudserver and the server response while upload with a 403/415 or another error