Revamp README and synchronize cross-platform shell updates #6

Job	Run time
arcadia-mobile-ios	1m 11s
arcadia-desktop-windows-headless	3m 1s
arcadia-desktop-linux-headless	45s
arcadia-desktop-macos-headless	1m 19s
arcadia-desktop-macos	3m 14s
arcadia-desktop-linux	3m 20s
arcadia-desktop-windows	6m 32s
Create Stable Release	0s
	19m 22s

Provide feedback