For mobile (#6523)

* ['notice' popover, 'all notice' dialog] fixup for mobile

* ['Files' page] fixed library icon size for mobile

* ['settings' page] fixup for 'Email notification'

* ['my libs'] fixed 'star/unstar', 'share', 'delete'

* ['deleted repos' dialog] modified column width of the table for mobile

* ['share' dialog] modified 'link details' panel for mobile

* [side panel resizer] removed it for mobile

* [group/department, shared with all] fixed the operation menu for mobile

* ['dir view'] don't offer 'repo history' page for mobile

* ['help'] fixup for page with large images, for mobile

- fixup for http://127.0.0.1:8000/help/drive_client_2.0_for_windows_10/
  (in mobile, the content of it overflowed to the right, and was cut off)

* ['file view'] removed 'history' page for mobile

* ['markdown file view'] removed 'history' page for small screen, mobile

* ['dir view'] added a gray layer to close the 'file/folder tree' panel in mobile

* ['dir view'] fixup for the 'path' bar in mobile

* ['dir view', 'shared dir view'] don't display the 'tag list' in root for mobile

frontend/src/components/file-view/file-toolbar.js

@@ -244,13 +244,6 @@ class FileToolbar extends React.Component {
                 {gettext('Share')}
               </DropdownItem>
             )}
-            {filePerm == 'rw' && (
-              <DropdownItem>
-                <a href={`${siteRoot}repo/file_revisions/${repoID}/?p=${encodeURIComponent(filePath)}&referer=${encodeURIComponent(location.href)}`} className="text-inherit">
-                  {gettext('History')}
-                </a>
-              </DropdownItem>
-            )}
             {canDownloadFile && (
               <DropdownItem>
                 <a href="?dl=1" className="text-inherit">