Minor updates to DataTables

[alistair3149]

• Bump DataTables to 2.2.2
• Drop unused Codex polyfill

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.39%. Comparing base (92e24f3) to head (df550dc).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #935   +/-   ##
=========================================
  Coverage     45.39%   45.39%           
  Complexity     2326     2326           
=========================================
  Files            80       80           
  Lines          9078     9078           
=========================================
  Hits           4121     4121           
  Misses         4957     4957           

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