docs: update deprecated server types

[apricote]

The CX Gen 2 and CPX Gen 1 types are deprecated and will be removed from the API at the end of the year. This replaces all usages in our docs so users do not have to figure it out themselves.

I kept the existing unit tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.59%. Comparing base (56997a1) to head (12c05dd).
⚠️ Report is 47 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #577   +/-   ##
=======================================
  Coverage   96.59%   96.59%           
=======================================
  Files          67       67           
  Lines        3402     3402           
=======================================
  Hits         3286     3286           
  Misses        116      116           

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