Data binding and style fixes

* added portfolio, mentors and management YAML files to be used in templating
* fixed issue with landing page not working properly in mobile view
* removed annoying page style that was applied to everything
* improved text sizes in various views
* reworked mentors view styles
* rearranged landing page vector graphics to match their meaning more
* code style improvements

assets/main.scss

@@ -28,3 +28,4 @@ h4 {
 @import 'helpdesk';
 @import 'ourwork';
 @import 'student';
+@import 'shared';