docs: updates to contribution.md

[carkod]

Corrected some words, added link to Cypress. In the case of hand written this should be spelled as hand-written or handwritten. See

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it across the finish line:

• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
• Run yarn test locally to catch errors. This ensures all components still behave as they should.
• Run yarn start to run the doc site locally and try a few pages, ensuring everything is in good working order.
• Include tests when adding/changing behavior.

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[codecov-commenter]

Codecov Report

Base: 99.75% // Head: 99.75% // No change to project coverage 👍

Coverage data is based on head (7527d17) compared to base (0e1a55a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4383   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files         180      180           
  Lines        3248     3248           
=======================================
  Hits         3240     3240           
  Misses          8        8           

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[layershifter]

👍

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉