Improve new course card layout

[Redande]

• Move language- and difficulty-tags to the right side
• Add circles under difficulty tags
• Remove sponsor logo

[Redande]

Draft until #1109 is merged and this is rebased on top of it

[codecov[bot]]

Codecov Report

Merging #1115 (1f24c5b) into master (a4ad212) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 1f24c5b differs from pull request most recent head 0f763a6. Consider uploading reports for the commit 0f763a6 to get more accurate results

@@           Coverage Diff           @@
##           master    #1115   +/-   ##
=======================================
  Coverage   67.81%   67.81%           
=======================================
  Files         117      117           
  Lines        4663     4663           
  Branches      999      999           
=======================================
  Hits         3162     3162           
  Misses       1391     1391           
  Partials      110      110           

Flag	Coverage Δ
backend	67.78% <ø> (ø)

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