wasm: one demo page with the whole pipeline (#157) #550

Job	Run time
test (stable)	2m 14s
wasm32 (declarative converters)	1m 4s
fmt · clippy (pinned)	26s
check (directml, windows-latest)	1m 30s
msrv (1.85 core · 1.88 workspace)	38s
check (cuda, ubuntu-latest)	37s
check (cuda,tensorrt, ubuntu-latest)	42s
check (coreml, macos-latest)	35s
release & publish	0s
	7m 46s

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