Adding expand icon for RHS (#3386)

* Adding expand icon for RHS

Fixing errors

Adding back getTeamInviteLink with better functionality for mobile

Adding vertical align to post__link

Updating improvements for expand RHS stuff

* Improving transition on mobile

* Removing irrelevant changes

webapp/utils/utils.jsx

@@ -598,6 +598,7 @@ export function applyTheme(theme) {
         changeCss('.app__body .popover.left>.arrow:after', 'border-left-color:' + theme.centerChannelBg, 1);
         changeCss('.app__body .popover.top>.arrow:after, .app__body .tip-overlay.tip-overlay--chat .arrow', 'border-top-color:' + theme.centerChannelBg, 1);
         changeCss('@media(min-width: 768px){.app__body .search-bar__container .search__form .search-bar, .app__body .form-control', 'background:' + theme.centerChannelBg, 1);
+        changeCss('@media(min-width: 768px){.app__body .sidebar--right.sidebar--right--expanded .sidebar-right-container', 'background:' + theme.centerChannelBg, 1);
         changeCss('.app__body .attachment__content', 'background:' + theme.centerChannelBg, 1);
         changeCss('body.app__body', 'scrollbar-face-color:' + theme.centerChannelBg, 2);
         changeCss('body.app__body', 'scrollbar-track-color:' + theme.centerChannelBg, 2);
@@ -607,7 +608,7 @@ export function applyTheme(theme) {
     if (theme.centerChannelColor) {
         changeCss('.app__body .post-list__arrows', 'fill:' + changeOpacity(theme.centerChannelColor, 0.3), 1);
         changeCss('.app__body .sidebar--left, .app__body .sidebar--right .sidebar--right__header, .app__body .suggestion-list__content .command', 'border-color:' + changeOpacity(theme.centerChannelColor, 0.2), 1);
-        changeCss('.app__body .input-group-addon, .app__body .app__content, .app__body .post-create__container .post-create-body .btn-file, .app__body .post-create__container .post-create-footer .msg-typing, .app__body .suggestion-list__content .command, .app__body .modal .modal-content, .app__body .dropdown-menu, .app__body .popover, .app__body .mentions__name, .app__body .tip-overlay', 'color:' + theme.centerChannelColor, 1);
+        changeCss('.app__body .input-group-addon, .app__body .app__content, .app__body .post-create__container .post-create-body .btn-file, .app__body .post-create__container .post-create-footer .msg-typing, .app__body .suggestion-list__content .command, .app__body .modal .modal-content, .app__body .dropdown-menu, .app__body .popover, .app__body .mentions__name, .app__body .tip-overlay, .app__body .form-control[disabled], .app__body .form-control[readonly], .app__body fieldset[disabled] .form-control', 'color:' + theme.centerChannelColor, 1);
         changeCss('.app__body .post .post__link', 'color:' + changeOpacity(theme.centerChannelColor, 0.65), 1);
         changeCss('.app__body #archive-link-home, .video-div .video-thumbnail__error', 'background:' + changeOpacity(theme.centerChannelColor, 0.15), 1);
         changeCss('.app__body #post-create', 'color:' + theme.centerChannelColor, 2);