Relocate directories/files to match new framework

[OCopping]

This PR moves techui-support into the t01- and b23-services example directories to match the new framework defined in https://app.excalidraw.com/l/7igwo1LrqWY/2KPz4QCkHwK.
It also removes opis/ and opis-src.

Waiting on #135

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.39%. Comparing base (be91dca) to head (e9da69a).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   55.96%   56.39%   +0.42%     
==========================================
  Files           7        7              
  Lines         570      571       +1     
==========================================
+ Hits          319      322       +3     
+ Misses        251      249       -2     

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