website: Removing outdated landing pages (#5441) #2172

Job	Run time
build_all_features	4m 46s
build_all_platforms (ubuntu-latest)	2m 38s
build_default_features (ubuntu-latest)	48s
build_all_platforms (macos-latest)	2m 38s
build_default_features (macos-latest)	37s
build_under_wasm	53s
build_default_features (windows-latest)	2m 3s
build_all_platforms (windows-latest)	5m 50s
check_clippy	4m 2s
check_docs	3m 17s
check_msrv	40s
unit	6m 27s
	34m 39s

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