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 

- Add announcements view using JSX to the dashboard sidebar
- Create a new maintenance interface to edit and manage announcements
- Adds an override to main.html template to include new skip links
- Add plugins required for announcements to TinyMCE

This is motivated by a desire to have system wide messages for students
that show on the dashboard. Enabled with FEATURES['ENABLE_ANNOUNCEMENTS'].
Global staff are allowed to edit from the studio maintenance view.

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.

Enable the journal app in LMS. Add support to display Journals on index
and courseware pages and dashboard.

Rebrand the branch.io text me the app landing page to reflect edX's style.

LEARNER-2730

LEARNER-3438

The user can now enroll in a session, unenroll from a session or change session
from a new course enrollment card on the programs dashboard.

LEARNER-2977

Fixes

LEARNER-1694

Fix a11y failure

Fix header styling

Fix layout issues

Further layout fixes

LEARNER-1857

This story constitutes a large change to the UX of the learner profile.

Some specific changes include adding a flexible learner profile card, limiting the bio entry to only 300 characters and assuring that the page is responsive.

LEARNER-1890

LEARNER-1312

LEARNER-877

LEARNER-39

LEARNER-39

ECOM-5936

TNL-5084

* Add openedx.core.lib.xblock_builtin.get_css_dependencies and get_js_dependencies,
  which respect PIPELINE_ENABLED setting when determining dependencies.
* Move new discussion-related Sass files into discussion subdirectory.
* Use "load_unicode" instead of "render_template" to load JS to add to fragment for DiscussionXBlock.
* Remove unused "course" parameter from context for DiscussionXBlock.student_view.
* Add RTL stylesheet for DiscussionXBlock, and enable the block to load correct stylesheet.
* Load MathJax only once, and include code for configuring MathJax in discussion bundle.
* Make sure username renders correctly in DiscussionXBlock response header.
* Move WYSIWYIG Markdown editor styles to _build-discussion.scss.
* Remove unnecessary import of discussion/utilities/v1-compatibility from _build-discussion.scss.
* Keep courseware-chromeless.html in sync with courseware.html.
* Load CSS for discussions on Teams tab.  This makes it possible to remove CSS for discussions from Sass files for "Course" tab.
* Load js/src/tooltip_manager.js, jquery.autocomplete.js and jquery.autocomplete.css on "Course" tab.

TNL-4877

* Add openedx.core.lib.xblock_builtin.get_css_dependencies and get_js_dependencies,
  which respect PIPELINE_ENABLED setting when determining dependencies.
* Move new discussion-related Sass files into discussion subdirectory.
* Use "load_unicode" instead of "render_template" to load JS to add to fragment for DiscussionXBlock.
* Remove unused "course" parameter from context for DiscussionXBlock.student_view.
* Add RTL stylesheet for DiscussionXBlock, and enable the block to load correct stylesheet.
* Load MathJax only once, and include code for configuring MathJax in discussion bundle.
* Make sure username renders correctly in DiscussionXBlock response header.
* Move WYSIWYIG Markdown editor styles to _build-discussion.scss.
* Remove unnecessary import of discussion/utilities/v1-compatibility from _build-discussion.scss.
* Keep courseware-chromeless.html in sync with courseware.html.
* Load CSS for discussions on Teams tab.  This makes it possible to remove CSS for discussions from Sass files for "Course" tab.
* Load js/src/tooltip_manager.js, jquery.autocomplete.js and jquery.autocomplete.css on "Course" tab.

TNL-5163

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

This work removes most references to XSeries from the LMS in an attempt to be more general. ECOM-5018.

TNL-4622