Add several icons to menus according to their roles

- refresh: https://tabler-icons.io/i/refresh
- edit: https://tabler-icons.io/i/edit
- delete: https://tabler-icons.io/i/delete
- mark page as read: https://tabler-icons.io/i/check
- mark all as read: https://tabler-icons.io/i/checks
- show all entries: https://tabler-icons.io/i/eye
- show only unread entries: https://tabler-icons.io/i/eye-off
- create category: https://tabler-icons.io/i/folder-plus
- add subscription: https://tabler-icons.io/i/plus
- import: https://tabler-icons.io/i/file-import
- export: https://tabler-icons.io/i/file-export
- categories: https://tabler-icons.io/i/folders