- Removed `unsafe-inline` for javascript from CSP.
The admin interface now uses files instead of inline javascript.
- Modified javascript to work not being inline.
- Run eslint over javascript and fixed some items.
- Added a `to_json` Handlebars helper.
Used at the diagnostics page.
- Changed `AdminTemplateData` struct to be smaller.
The `config` was always added, but only used at one page.
Same goes for `can_backup` and `version`.
- Also inlined CSS.
We can't remove the `unsafe-inline` from css, because that seems to
break the web-vault currently. That might need some further checks.
But for now the 404 page and all the admin pages are clear of inline scripts and styles.
