refactor: remove old Gitpod configuration

[AngryMaciek]

Types of changes 🔧

What type of changes does your code introduce to the project?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Checklist ✅

If you're unsure about any of those below, ask explicitly.
This is simply a reminder of what needs to be checked before merging your code.

• I have read the CONTRIBUTING.
• I have performed a self-review of my own code.
• Tests specified with the 'make' framework do not raise any errors.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate).
• My changes generate no new warnings.
• I have commented my code, particularly in hard-to-understand areas.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f832ba6) 99.27% compared to head (88975b7) 99.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #33   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files           5        5           
  Lines         965      965           
  Branches      205      205           
=======================================
  Hits          958      958           
  Partials        7        7           

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