Show features in documentation #1089

Job	Run time
cargo-deny	21s
build_benchmarks	45s
Fuzz targets (afl)	1m 54s
Fuzz targets (cargo-fuzz)	4m 6s
clippy	2m 21s
public_private_dependencies	18s
rustfmt	14s
test_avif	1m 39s
test_avif_decoding	1m 15s
test_big_endian	1m 7s
test_big_endian (default)	2m 27s
test_features	30s
test_toolchains (1.61.0)	1m 23s
test_big_endian (webp)	1m 10s
test_features (default)	1m 19s
verify_msrv	54s
test_toolchains (nightly)	1m 48s
test_big_endian (webp-encoder)	2m 3s
test_features (gif)	33s
test_toolchains (beta)	1m 43s
test_features (jpeg)	34s
test_features (png)	32s
test_features (tiff)	33s
test_features (ico)	37s
test_features (pnm)	25s
test_features (tga)	27s
test_features (webp)	25s
test_features (bmp)	38s
test_features (hdr)	29s
test_features (dxt)	34s
test_features (dds)	35s
test_features (farbfeld)	34s
test_features (openexr)	41s
test_features (jpeg_rayon)	31s
test_features (webp-encoder)	1m 4s
	36m 29s

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