Filter ended courses from modules page

[mipyykko]

• active courses first, then upcoming (should it be the other way around?), ended not shown
• the order in database (order, studyModuleOrder) is not used for now, probably should
• if there are ended courses in the module, link to the course catalogue with that specific module and tag
• course catalogue now supports query parameters (tag, status) that update in the URL
• course catalogue shows a status of what is shown and with which criteria
• ended courses show up as greyed out(ish)
• fixed front page bottom margin

[codecov]

Codecov Report

Merging #1204 (2a331fd) into master (dc0849d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1204   +/-   ##
=======================================
  Coverage   64.15%   64.15%           
=======================================
  Files         124      124           
  Lines        5306     5306           
  Branches     1234     1234           
=======================================
  Hits         3404     3404           
  Misses       1773     1773           
  Partials      129      129           

Flag	Coverage Δ
backend	64.15% <ø> (ø)

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