This commit adds to the experimental user menu a new "other notifications" tab that's very similar to the "all notifications" tab, but with the main difference being that it doesn't show notification types that do have dedicated tabs in the menu (e.g. mentions, likes, replies etc.).
The rationale behind this is that the notification types that do have dedicated tabs tend to dominate the "all notifications" tab, leaving very small chances for the user to notice rarer or infrequent notification types. Adding a tab for all the other types gives the user a way to review those infrequent notification types.
Internal ticket: t72978.
Co-authored-by: OsamaSayegh <asooomaasoooma90@gmail.com>
Instead of relying on another help to generate the icons, we want to
rely on the interface for adding prefix icons. This ensures that prefix
icons are consistent across the section links in Sidebar
When the experimental Sidebar is enabled, the hamburger drop down is replaced by a sidebar drop down. A user is given the ability to dock and undock the sidebar depending on their personal preference.
Do also note that the experimental sidebar is well, considered experimental at this point so I do not intend for the features here to be perfect. What I aim to do here is to ship the changes fast so that it can be used internally by the team to provide feedback. Custom links added by plugins and dark mode toggle has not been implemented as part of this commit as I aim to tackle it in another commit.
Co-authored-by: awesomerobot <kris.aubuchon@discourse.org>
Note this commit also introduce a new {{d-popover}} component, example usage:
```hbs
{{#d-popover |state|}}
{{d-button label="foo.things" class="d-popover-trigger"}}
<div class="d-popover-content">
Some content
<div>
{{/d-popover}}
```
