CTC-1518 Update links to Kentico Learn

[jancerman]

Motivation

Fixes https://kentico.atlassian.net/browse/CTC-1518

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[codecov[bot]]

Codecov Report

Merging #113 (9fb7eb8) into master (9525e06) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #113   +/-   ##
=========================================
  Coverage     98.13%   98.13%           
  Complexity      195      195           
=========================================
  Files            22       22           
  Lines           591      591           
=========================================
  Hits            580      580           
  Misses           11       11           

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