Add alternate links to crawlable Markdown versions of pages #353

Job	Run time
test	39s
test_compatibility (3.14, py314-dj52,py314-djmain)	52s
test_compatibility (3.10, py310-dj42,py310-dj52)	50s
test_compatibility (3.12, py312-dj42,py312-dj52,py312-dj60)	1m 3s
test_compatibility (3.13, py313-dj42,py313-dj52,py313-dj60)	1m 5s
build_site	1m 8s
test_compatibility (3.11, py311-dj42,py311-dj52)	48s
deploy_site	18s
	6m 43s

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