make the help more pleasant by adding kbd tags
Merge pull request #444 from ailin-nemui/help-kbd

make the help more pleasant by adding kbd tags
Properly Show and hide the sidebar on mobile layout when using Alt+g
Merge pull request #446 from ailin-nemui/show-sidebar

Properly Show and hide the sidebar on mobile layout when using Alt+g
Support narrowing buffer selection with Alt+0-9 after using Alt+g or when onlyUnread is enabled, and show numeric overlays for Alt+0-9 keys on the buffers