Switch to one column at medium width instead of small on individual page

[ekdahl]

I think it gets a bit "crowdy" with two columns on such thin widths. This change alters the threshold for when to switch between one and two columns.

Smallest width with two columns before change:

Smallest width with two columns after change:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.47%. Comparing base (a0e5fa6) to head (198c75d).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5184   +/-   ##
=========================================
  Coverage     35.47%   35.47%           
  Complexity    11183    11183           
=========================================
  Files          1159     1159           
  Lines         47918    47918           
=========================================
  Hits          16997    16997           
  Misses        30921    30921           

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