feat(#92): add cypress test framework

[captaindav]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other / Project management.

Description

• Added Cypress test framework
• Added initial e2e tests for DruxtSite
• Added e2e testing in CircleCI

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

Screenshots/Media:

[changeset-bot]

⚠️ No Changeset found

Latest commit: a612a33

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[codecov]

Codecov Report

Merging #551 (a612a33) into develop (22a4015) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #551   +/-   ##
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  Coverage    96.60%   96.60%           
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  Files           86       86           
  Lines         2212     2212           
  Branches       432      432           
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  Hits          2137     2137           
  Misses          68       68           
  Partials         7        7           

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[Decipher]

LGTM