1.16.0

Added

• Display all categories related to blogposts on the News page,
• Add Cypress-based end-to-end tests that check accessibility with axe.

Changed

• Rename all occurences of the "form_factor" variable to "variant",
• Restructure categories glimpse/plugin for modularity and harmonization,
• Update the frontend build to supported outdated browsers such as IE11.
• Segment course runs according to status on course detail page,
• Our course search fields now have a "Search" button with a magnifying
  glass icon.

Fixed

• Make placeholders work on a page created with PageFactory by rescanning
  placeholders,
• Improve responsiveness of footer logos and person categories that were not
  folding properly,
• Pin Django to version less than 3.0.