Update location of the contributor guidelines file

[emmanuel-ferdman]

By submitting this pull request I confirm I've read and complied with the below requirements 🖖

Requirements for your pull request

• The certificate/course you want to add has to be provided for free and not a trial membership or time-based offer.
• This pull request should have the name of courses/certificates in the format Add Name of Course(s)/Certificate(s).
  • ✅ Add Java Introduction
  • ❌ Update readme.md
• Your entry should be added at the bottom of the appropriate category.
• Not a duplicate. Please search for existing submissions.
• Make sure the course link is working.
• Has consistent formatting and proper spelling/grammar.
  • Consistent and correct naming. For example, Node.js, not NodeJS or node.js.
• To verify that you've read all the guidelines, please comment on your pull request with just the word unicorn.

PR Summary

Commit e990f7636ff7f1052354c0da8a02456686394f5a renamed the contributor guidelines file's name. This PR adjusts sources to changes.