Show features in documentation #1131

Job	Run time
Fuzz targets (afl)	1m 33s
cargo-deny	20s
build_benchmarks	42s
Fuzz targets (cargo-fuzz)	4m 16s
clippy	2m 15s
public_private_dependencies	16s
rustfmt	13s
test_avif	1m 13s
test_avif_decoding	1m 19s
test_big_endian	49s
test_features	25s
test_big_endian (default)	2m 14s
test_toolchains (1.61.0)	55s
verify_msrv	1m 49s
test_features (default)	1m 14s
test_big_endian (webp)	59s
test_toolchains (nightly)	1m 16s
test_features (gif)	36s
test_big_endian (webp-encoder)	2m 1s
test_toolchains (beta)	1m 20s
test_features (jpeg)	31s
test_features (png)	30s
test_features (tiff)	28s
test_features (ico)	32s
test_features (pnm)	23s
test_features (tga)	31s
test_features (webp)	23s
test_features (bmp)	28s
test_features (hdr)	29s
test_features (dxt)	29s
test_features (dds)	30s
test_features (farbfeld)	25s
test_features (openexr)	37s
test_features (jpeg_rayon)	34s
test_features (webp-encoder)	49s
	33m 24s

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