Add Deno instructions to docs

[jespertheend]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
resolves #4310

Description

[lukastaegert]

Thanks, looks good!

[codecov]

Codecov Report

Merging #4311 (ef38993) into master (e17a379) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4311   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files         205      205           
  Lines        7316     7316           
  Branches     2084     2084           
=======================================
  Hits         7202     7202           
  Misses         55       55           
  Partials       59       59           

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[dnalborczyk]

@jespertheend you might have to run npm run lint which should fix the doc formatting.

[jespertheend]

Thanks! I edited it on github.com so I wasn't aware npm run lint was a thing. I think this resolves it.