This commit converts the current chat plugin UI into the
new "show plugin" UI already followed by AI and Gamification.
In the process, I also:
* Made a dedicated /new route to create new webhooks
* Converted the webhook form to FormKit
* Made some fixes and improvements to the `AdminPluginConfigPage`, `AdminPageHeader`,
and `AdminPageSubheader` generic components, so more plugins can
adopt the UI guidelines too. This includes adding a header outlet so plugins
can add action buttons to the plugin show page header.
* Fixes the submit button loading state for FormKit (by Joffrey)
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Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>
This commit converts the Backups page in the admin interface
to follow our new admin interface guidelines.
As part of this work, I've also made `AdminPageHeader` and `AdminPageSubheader`
components that can be reused on any admin page for consistency, that handle
the title and action buttons and also breadcrumbs.
Also renamed `AdminPluginFilteredSiteSettings` to `AdminFilteredSiteSettings` since
it can be used generally to show a subset of filtered site settings, not only
settings for a plugin. Not sure if it's ideal to have to define a new route for this
for every config area, but not sure how else to do it right now.
