Remove 3.0 release announcement (#217) #743

Job	Run time
cargo-lock	8s
version-sync	5s
compilation-benchmarks	2m 0s
cargo-doc (ubuntu)	19s
cargo-miri	1m 33s
cargo-doc (windows)	1m 20s
cargo-fmt	18s
runtime-benchmarks (args_3)	1m 0s
cargo-doc (macos)	37s
runtime-benchmarks (args_5)	1m 0s
test-msrv (ubuntu)	1m 5s
runtime-benchmarks (args_10_alloc)	57s
test-stable (ubuntu)	1m 20s
test-msrv (windows)	1m 42s
runtime-benchmarks (args_10_structs)	54s
test-stable (windows)	3m 1s
test-unstable (beta)	29s
test-msrv (macos)	1m 2s
test-stable (macos)	1m 19s
runtime-benchmarks (args_10)	1m 9s
test-unstable (nightly)	25s
runtime-benchmarks (args_20)	54s
cargo-machete	4s
prettier	7s
taplo-fmt	3s
website-build	20s
typos	8s
	23m 19s

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