refs https://github.com/TryGhost/Ghost/issues/9505
- remove unordered and bullet list icons from the (+) and / menus
- add unordered and bullet list icons to the formatting toolbar
- reorder toolbar icons to match latest design specs
- remove now-unused `replaceWithListItem` actions
refs https://github.com/TryGhost/Ghost/issues/9311
- we don't and will unlikely ever have a "Text" card
- commented out the search input and "Primary" header, it won't be used until we have many more cards
refs https://github.com/TryGhost/Ghost/issues/9311
- add a basic HTML card that renders a CodeMirror editor
- adjust styles so that CodeMirror styles for the markdown editor don't affect CodeMirror instances inside Koenig
refs https://github.com/TryGhost/Ghost/issues/9311
- use the `{{inline-svg}}` helper instead of having SVGs inlined manually in the component template
- rename the koenig icons directory
- add the koenig icons directory to the list of locations used by `{{inline-svg}}`
refs https://github.com/TryGhost/Ghost/issues/9311
- re-implement the (+) card/list selection menu from the old Koenig alpha with improved positioning and event handling
- buttons work for the currently available cards - `<hr>` and `markdown`
