Improve spotlight

HISTORY.md

packages/rocketchat-theme/assets/stylesheets/base.less

...etchat-theme/assets/stylesheets/utils/_colors.import.less

...s/rocketchat-ui-message/message/popup/messagePopup.coffee

...ges/rocketchat-ui-message/message/popup/messagePopup.html

packages/rocketchat-ui/package.js

packages/rocketchat-ui/views/app/spotlight/spotlight.coffee

packages/rocketchat-ui/views/app/spotlight/spotlight.html

.../rocketchat-ui/views/app/spotlight/spotlightTemplate.html

...es/rocketchat-ui/views/app/spotlight/spotlightTemplate.js