Update contributing guidelines

[IndrajeetPatil]

There might be some whitespace changes, so you use the GitHub GUI feature to hide them and focus on the content-related changes.

[codecov-commenter]

Codecov Report

Merging #1047 (8e08f43) into main (4c1cb51) will not change coverage.
The diff coverage is n/a.

❗ Current head 8e08f43 differs from pull request most recent head 1f70d1f. Consider uploading reports for the commit 1f70d1f to get more accurate results

@@           Coverage Diff           @@
##             main    #1047   +/-   ##
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  Coverage   91.06%   91.06%           
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  Files          46       46           
  Lines        2687     2687           
=======================================
  Hits         2447     2447           
  Misses        240      240           

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[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 742bc7b is merged into main:

•   :ballot_box_with_check:cache_applying: 35.8ms -> 36ms [-1.54%, +3.17%]
•   :ballot_box_with_check:cache_recording: 1.2s -> 1.19s [-1.68%, +0.16%]
•   :ballot_box_with_check:without_cache: 3.01s -> 3s [-0.88%, +0.5%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[lorenzwalthert]

looks good, thanks. We might want to also update some parts that are out of date like file structure or how to we use {fledge}, but we can merge these changes already.