update readme for latests changes in installation

[trappitsch]

Update to the readme for the latest changes, also adds how to install the latest pre-release from pypi.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.19%. Comparing base (32fb9dc) to head (0ea25cc).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #458   +/-   ##
=======================================
  Coverage   99.19%   99.19%           
=======================================
  Files          94       94           
  Lines        9561     9561           
=======================================
  Hits         9484     9484           
  Misses         77       77           

Flag	Coverage Δ
unittests	99.19% <ø> (ø)

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