* [user panel] combined 7 commits into 1:
[user side nav] added 'fold/unfold' for the sidebar
[redesign] redesigned toolbar for 'my libs' & 'shared with all'; redesigned 'top bar' for 'help', 'clients' and other pages
[Shared with all] 'share existing libraries' dialog: added the 'close' icon back, enabled clicking outside to close the dialog
['Invite Guest' page] redesigned the toolbar
['Share Admin' - 'Links'] 'Share Links' page: redesigned the toolbar
['Share Admin' - 'Links'] 'Upload Links' page: redesigned the toolbar
cleaned up code
* [user side panel] update
* [user panel] update
* [code style] update: remove an eslint warning
* [settings] redesigned the 'heading' bar; fixup for the side nav; improved UI for content headings
* [settings] resigned it (the top bar, the side panel; the code frame)
* [top bar, side panel] modified UI of the top bar; redesigned the side panel(moved the content in the bottom to the side nav)
* [font icons] updated the 'department' & 'invite Guest' icons
* [linked devices] moved it from the 'home' side panel to the 'settings' page
* ['settings' page] redesigned the empty tip for 'linked devices'
