fix: update README.rst

[CodeWithEmad]

This will fix typos, add code-blocks and highlighting for better readability

[openedx-webhooks]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.26%. Comparing base (10f906b) to head (3a631ec).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #208   +/-   ##
=======================================
  Coverage   83.26%   83.26%           
=======================================
  Files          47       47           
  Lines         693      693           
  Branches      135      135           
=======================================
  Hits          577      577           
  Misses        116      116           

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[bradenmacdonald]

Nice cleanup - thanks!

[openedx-webhooks]

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