DOC: switch to source code link button #339

Job	Run time
pytest / Determine job matrix	6s
style / Determine skipped pre-commit hooks	8s
doc / linkcheck / Check external links	59s
doc / nb / Execute and build documentation	2m 23s
pytest / Run unit tests (3.10, ubuntu-22.04)	1m 43s
pytest / Run unit tests (3.11, ubuntu-22.04)	1m 28s
pytest / Run unit tests (3.12, ubuntu-22.04)	1m 43s
pytest / Run unit tests (3.7, ubuntu-22.04)	1m 55s
pytest / Run unit tests (3.8, ubuntu-22.04)	1m 41s
pytest / Run unit tests (3.6, ubuntu-20.04)	1m 50s
pytest / Run unit tests (3.9, ubuntu-22.04, qrules)	4m 13s
pytest / Run unit tests (3.9, macos-12)	1m 44s
style / Run local pre-commit hooks	1m 13s
style / Run taplo through pre-commit	28s
style / Push changes	0s
doc / Upload to GitHub Pages	0s
	21m 34s

Provide feedback