docs: remove CodeFund sponsor

[andrewmcodes]

What:

Remove CodeFund sponsor ad from the README

Why:

CodeFund is not allowed to place ads on README's anymore according to GitHub. Please reach out to our team if you have any questions :slightly_smiling_face:

How:

Remove code from the top of the README

Checklist:

• [x] Documentation
• [ ] Tests N/A
• [x] Ready to be merged
• [ ] Added myself to contributors table

[codecov[bot]]

Codecov Report

Merging #65 into master will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #65   +/-   ##
=======================================
  Coverage   39.67%   39.67%           
=======================================
  Files          22       22           
  Lines         431      431           
  Branches       66       66           
=======================================
  Hits          171      171           
  Misses        217      217           
  Partials       43       43           

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