feat: add beta-5 milestone #312

Job	Run time
nix-fmt-check	24s
nix-build-book	30s
nix-build (fuel, ubuntu-latest)	9s
nix-build (fuel, macos-latest)	45s
nix-build (fuel, macos-latest-xlarge)	39s
nix-build (fuel-beta-3, ubuntu-latest)	10s
nix-build (fuel-beta-3, macos-latest)	53s
nix-build (fuel-beta-3, macos-latest-xlarge)	40s
nix-build (fuel-beta-4, ubuntu-latest)	10s
nix-build (fuel-beta-4, macos-latest)	47s
nix-build (fuel-beta-4, macos-latest-xlarge)	30s
nix-build (fuel-nightly, ubuntu-latest)	12s
nix-build (fuel-nightly, macos-latest)	22s
nix-build (fuel-nightly, macos-latest-xlarge)	29s
nix-build (sway-vim, ubuntu-latest)	10s
nix-build (sway-vim, macos-latest)	1s
nix-build (sway-vim, macos-latest-xlarge)	25s
nix-develop	1s
	7m 17s

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