Some words in the contribution guide

[kennethshsu]

• I tried to follow the old instructions on how to get dev environment up in uv and it didn't quite work
• Added some more clarification stuff and rearranged sections
• Also fixed a deadline
• Do we want to add uv.lock to gitignore? I don't think we should to make the commit reproducible, but it is another file that will be tracked if we don't @jbogaardt

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.91%. Comparing base (5309728) to head (bd7fca5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #603   +/-   ##
=======================================
  Coverage   81.91%   81.91%           
=======================================
  Files          83       83           
  Lines        4805     4805           
  Branches      606      606           
=======================================
  Hits         3936     3936           
  Misses        654      654           
  Partials      215      215           

Flag	Coverage Δ
unittests	81.91% <ø> (ø)

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