chore: Purge v1

[gselzer]

This PR removes the original NDV application, and I believe that now is the right time to remove it because:

• With the merge of feat: Rectangular ROIs #114 we should now be at feature parity
• Tests specific to v1 are now failing in feat: rgb, v2 #141, meaning it will take active maintenance to maintain. While I haven't gotten to the bottom of these failures, I can't reproduce them easily either.

What do you think, @tlambert03?

[tlambert03]

Kill it :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.35%. Comparing base (b393238) to head (2963522).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   79.23%   80.35%   +1.11%     
==========================================
  Files          51       44       -7     
  Lines        5172     4112    -1060     
==========================================
- Hits         4098     3304     -794     
+ Misses       1074      808     -266     

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