issue #5483 & #5652
- trigger the close menus action every time a route transition is successful
- close nav menu when clicking "collapse sidebar" button (action chain was incomplete)
- [x] Mobilemenu button is missing from `content` and `editor` views
- [x] Mobilemenu pane slides entire content over, should expand over-top-of-content
- [x] Mobilemenu can't be closed
- [x] gh-view-title no longer generates an extra div; it is the h2.
- [x] gh-autonav-toggle closes the mobile menu on mobile. renamed `gh-menu-toggle`
- [ ] There is weird behaviour with mobile menu when changing from big=>small=>big viewport sizes
- ~~[ ] (Future issue) Ghost should remember (localstorage?) whether desktop menu is expanded or collapsed~~
- Adds gh-view-title component to implement mobile menu button for titles on any page
- Refactors the `content-cover` out into the application template
- Fix various z-index issues with content-cover and gh-alert
- Move `.settings-menu-expanded` application view state from body to `.gh-viewport`
- Unify nav menu / mobile menu actions and code
References #5071
- Re-implements the previously broken top notification styles
- Moves the top notification outlet outside the `<main>` to ease styling (we have several nested position fixed/absolute boxes that make this tough - moving the outlet makes it easier)
