fixup! trying to "fix" underscore syntax error

add cancel modal test

Fix quality issues.

Apply Nimisha's suggestions for my quality fixes.

Skip test_drop_unit_in_collapsed_subsection

Fix quality error

Add Cielo Username

- EDUCATOR-1456

LEARNER-2754

Make modal intro text darker.

Make intro message dark in the base modal scss

LEARNER-2977

Fixes

LEARNER-1705

FEDX-375

EDUCATOR-1037

EDUCATOR-625, AC-620

LEARNER-2017

Separates archived courses into a different tab on the Studio index page.

Data is rendered synchronously, but tests are added to ensure that no new sql
or mongo queries were required.

LEARNER-1982

LEARNER-1879

Issues with images overflowing over their container divs and images being too large for the containing div. Also did a bit of cleanup to improve scss quality.

Video Uploads Cleanup - Replace table grid layout with div grid layout and do related adjustments - EDUCATOR-562

EDUCATOR-44

AC-727
began changing colors in course content, files and uploads, and when creating a course

finished fixing contrast issues on files and uploads page

fixed advanced settings and issue with hovering in files and uploads

fixed color issues in studio home page and when hovering

fixed contrast in updates, pages, textbooks, and group configurations

fixed issues when configuring a section of a course in course outline

fixed hovering colors to make contrast more visible

fixed colors on the green button

AC-727

EDUCATOR-563

EDUCATOR-292

EDUCATOR-396

EDUCATOR-61