- add model CustomerPackageDiskUsage for hosting package disk usage
statistics
- add REST API endpoint for submittings statistics for disk, mysql and
pgsql usage
- add disk usage information to hosting package detail view
- add separate hosting package disk usage statistic view
- remove customer hosting package list
- replace useless dashboard with redirect
- move all hosting package list for superuser to top level menu item
- replace btn-default with btn-secondary
- improve email address management page
- drop jQuery and fontawesome dependencies
- add bootstrap5 and bootstrap-icons
- update fonts mfizz
- update base templates and the first set of other templates
- replace blocktrans and trans with blocktranslate and translate to
prepare for Django 4
- move hostingpakcage templates to hostingpackages/templates
- update translations
