Rename 'sort' query parameter to 's'

[loevgaard]

This is only done to make the query string shorter. There will be another PR doing the same for facets/filters, so we end up having p, s, f, and q as root level query parameters for the search

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 32.08%. Comparing base (ef4a199) to head (40c4817).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Form/Builder/SearchFormBuilder.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #40   +/-   ##
=========================================
  Coverage     32.08%   32.08%           
  Complexity      556      556           
=========================================
  Files           112      112           
  Lines          1920     1920           
=========================================
  Hits            616      616           
  Misses         1304     1304           

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