Updated installation instructions on the readme page.

[jesper-friis]

Description

Updated installation instructions on the readme page.

Also updated optional dependencies in pyproject.toml accordingly.

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.61%. Comparing base (a486d24) to head (6139763).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #415   +/-   ##
=======================================
  Coverage   76.61%   76.61%           
=======================================
  Files          28       28           
  Lines        4002     4002           
=======================================
  Hits         3066     3066           
  Misses        936      936           

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