Datascience theme: links are now blue and underlined
Change background color of sidebars on home page
Datascience theme: don't display meta information
Wrap widgets in "widget" class
Datascience theme: bigger titles on pages, smaller titles on widgets
Remove page title on homepage

Widgets already provide a title.

This change was already applied to the master branch as part of the page
rendering changes.
Datascience theme: remove different coloring in article intro
Wrap article teaser text and links in "article_teaser_text" div
Remove extra spaces in ArticleListView
Datascience theme: don't let text flow under image in article teasers
Add with_featured_image class to articles when they have such an image
Datasciene theme: fix article teaser text width bug

The whole width can be used when there is no featured image.
Datasciene theme: larger margins for arrow links