DOC: switch to source code link button #786

Job	Run time
style / Determine skipped pre-commit hooks	9s
pytest / Determine job matrix	10s
doc / nb / Execute and build documentation	1m 58s
doc / linkcheck / Check external links	2m 37s
style / Run taplo through pre-commit	19s
style / Run local pre-commit hooks	2m 20s
pytest / Run unit tests (3.10, ubuntu-22.04)	2m 31s
pytest / Run unit tests (3.11, ubuntu-22.04)	2m 37s
pytest / Run unit tests (3.8, ubuntu-22.04)	2m 34s
pytest / Run unit tests (3.9, ubuntu-22.04, tensorwaves)	3m 29s
pytest / Run unit tests (3.9, macos-12)	6m 40s
style / Push changes	0s
doc / Upload to GitHub Pages	0s
	25m 24s

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