removed old js files from html experiment

bigbluebutton-client/resources/prod/js/collections/users.js

...on-client/resources/prod/js/libs/backbone/backbone-min.js

...uebutton-client/resources/prod/js/libs/require/require.js

...lient/resources/prod/js/libs/underscore/underscore-min.js

bigbluebutton-client/resources/prod/js/models/chat.js

...luebutton-client/resources/prod/js/models/presentation.js

bigbluebutton-client/resources/prod/js/models/users.js

bigbluebutton-client/resources/prod/js/models/whiteboard.js

bigbluebutton-client/resources/prod/js/views/users/list.js

bigbluebutton-client/resources/prod/js/views/users/user.js