[ADD] Integrity hashes

[ppfeufer]

Description

Added

• Integrity hashes to CSS and JavaScript

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.18%. Comparing base (7b1f1f6) to head (8055e87).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #365   +/-   ##
=======================================
  Coverage   70.18%   70.18%           
=======================================
  Files          28       28           
  Lines        1294     1294           
  Branches      114      114           
=======================================
  Hits          908      908           
  Misses        369      369           
  Partials       17       17           

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