sidebar adjustments and new flexnav

package.json

...ges/rocketchat-theme/client/imports/components/avatar.css

...ages/rocketchat-theme/client/imports/components/badge.css

...s/rocketchat-theme/client/imports/components/flex-nav.css

...cketchat-theme/client/imports/components/main-content.css

...es/rocketchat-theme/client/imports/components/popover.css

...es/rocketchat-theme/client/imports/components/sidebar.css

...es/rocketchat-theme/client/imports/components/tooltip.css

packages/rocketchat-theme/client/imports/general/base.css

...ages/rocketchat-theme/client/imports/general/base_old.css

packages/rocketchat-theme/client/main.css

packages/rocketchat-theme/server/variables.js

packages/rocketchat-ui-account/client/accountFlex.html

packages/rocketchat-ui-account/client/accountFlex.js

packages/rocketchat-ui-flextab/client/tabs/membersList.html

packages/rocketchat-ui-master/server/inject.js

packages/rocketchat-ui-master/server/page-loading.css

packages/rocketchat-ui-sidenav/client/accountBox.html

packages/rocketchat-ui-sidenav/client/accountBox.js

packages/rocketchat-ui-sidenav/client/sideNav.html