1. The events table had broken styling, making each row overflow
2. It had confusing routes: `/:id` for "edit" and `/:id/events` for "show" (now it's `/:id/edit` and `/:id` respectively)
3. There previously was an unused backend action (`#edit`) - now it is used (and `web_hooks/:id/events` route has been removed)
4. There was outdated/misplaced/duplicated CSS
5. And more
`Route#render` and `Route#renderTemplate` have been deprecated and are removed in Ember 4.x (see: https://deprecations.emberjs.com/v3.x#toc_route-render-template)
The templates of modified routes in this PR are already automatically inserted into `{{outlet}}`s.
