Contrast improvements in light mode

Description

Mainly tweaked the widgets and search ui to follow new design in Figma. Note that the translations for the suggestions widget title are still in all caps and need to be fixed.

Issue(s)

https://gitlab.e.foundation/groups/e/os/-/epics/15 https://gitlab.e.foundation/e/os/backlog/-/issues/210 https://gitlab.e.foundation/e/os/backlog/-/issues/211 https://gitlab.e.foundation/e/os/backlog/-/issues/212

Test environment

Test procedures

Technical details

Screenshots

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation