Set up Prettier for auto-formatting #341

Job	Run time
test	36s
build_site	41s
test_compatibility (3.12, py312-dj42,py312-dj52)	47s
test_compatibility (3.10, py310-dj42,py310-dj51,py310-dj52)	1m 11s
test_compatibility (3.11, py311-dj42,py311-dj51,py311-dj52)	55s
test_compatibility (3.13, py313-dj42,py313-dj52,py312-djmain)	1m 10s
deploy_site	0s
	5m 20s

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