This also has an initial use case for Personalized Learner Schedules
to add CTAs to capa and vertical blocks to allow users to shift their
course deadlines.

- use new dates banner template on course outline page
- remove old banner from main.html
- let dates tab use new dates banner template
- remove dates banner completely from the courseware problem view
  on the web app
- use new banner on the courseware problem view on the mobile app
- update banner util to use get_course_blocks

* Fix all stylelint errors

For any errors that fixing would require changing the output of the css disable stylelint for that line instead of modifying.

* Update quality.py

Make stylelint quality check pass when there are no errors

* Delete empty selectors

- for self paced courses, if a sequential's due date has passed
  and it is incomplete, allow the user to reset the start_date
  for the related schedule to now, thus shifting all due dates
  for all sequentials within the course by the pre determined
  due date offset.
- add historical table to the Schedule model.

REV-980

This reverts commit 059b6197.

REV-980.
* moved get_first_purchase_offer_banner_fragment to Discounts utils.py
* added banner wrapper method
* updated banner with time limit 

Changes:
- Add logo back
- Fix up spacing
- Change font sizes and color

Moves banner into the content instead of at the top. Adds a course
expiration fragment to the course home page, the content, the progress
page, and the discussion page.

update css

updated css

make modal experimental

add waffle flag

LEARNER-2754

LEARNER-2977

Fixes

Updates the new bootstrap course home page to match the old course home page.

LEARNER-1923

LEARNER-142

to the Micromasters page

LEARNER-1705

LEARNER-1694

Fix a11y failure

Fix header styling

Fix layout issues

Further layout fixes