Template were using global TECH_SUPPORT_EMAIL for error pages. This
changes them to use the site email if there is one.

Adding a reviews page to the course and updating the reviews module on the course about page. Removed the existing coursetalk implementation and put it in a fragment, removed the tests as well. Added configuration settings to specify the reviews template as well as the reviews provider. This is all protected by a waffle flag.

If verification status is pending, the top border is now colored blue, in a manner similar to the success and failure states.

LEARNER-1486

Also apply variables for FB/Linkedin OAuth2 rather than
leave color hashes hanging around.

updated visual styles to remove rebase issues and borders from previous merges, as well as a small set of visual clarity improvements to the course dashboard view.

Removes most remaining hardcoded references to XSeries from the LMS. Part of ECOM-4638.

ECOM-4398

ECOM-3729

Updated dashboard UI for empty list of courses and programs

Updated dashboard UI for empty list of courses and programs

This reverts commit 628843f6.

Updated dashboard UI for empty list of courses and programs

remove unnecessary parentheses

change css properties for mixins bi-aap in login/register page

change css properties for mixins bi-app in about course page

change css properties for mixins bi-app in the dashboard

change css properties for mixins bi-app in help template

change css properties for mixins bi-app in the home page

change css properties for mixins bi-app in jobs, press and media pages

remove the extra spaces

- Icon images can be uploaded from the django admin
- Test coverage improved

- Icon images can be uploaded from the django admin
- Test coverage improved

It looks like in the past there used to be several tabs on the
course about page, but the other tabs have been commented
out years ago.

Having a single tab is pointless and confusing, so remove it.

Move tests to one test class

ECOM-3015

This reverts commit 46df4545, reversing
changes made to 039e6cdf.

ECOM-3015

- Simplified logic determiningg credit messaging on dashboard
- Fixed bug preventing users from initiating credit request

ECOM-2893