Added link to new video (from me)

[bkoelman]

Check out https://www.youtube.com/watch?v=79Oq0HOxyeI, where I'm giving a presentation on JSON:API and JsonApiDotNetCore. Demo at the end!

Fixed broken links in API Reference on documentation website.

Before:

After:

QUALITY CHECKLIST

• N/A: Changes implemented in code
• N/A: Complies with our contributing guidelines
• N/A: Adapted tests
• Documentation updated

[codecov]

Codecov Report

Merging #1147 (7fefe3b) into master (5b99f22) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1147   +/-   ##
=======================================
  Coverage   89.46%   89.46%           
=======================================
  Files         242      242           
  Lines        7213     7213           
=======================================
  Hits         6453     6453           
  Misses        760      760           

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