Update workspace dependencies structure #832

Job	Run time
cargo (cargo fmt --verbose --all -- --check)	1m 5s
nix-fmt-check	32s
nix-flake-check (ubuntu-latest)	30s
cargo (cargo check --locked --workspace)	4m 10s
cargo (cargo check --locked --examples --workspace)	4m 59s
nix-flake-check (macos-latest)	1m 40s
cargo (cargo check --locked --examples --workspace --all-features)	5m 38s
cargo (cargo doc --locked --workspace --features "egui")	8m 3s
cargo (cargo test --locked -p nannou_core --no-default-features --features "libm serde")	1m 22s
cargo (mdbook build guide/)	1m 10s
cargo (cargo test --locked -p book_tests)	6m 37s
verifications	1s
cargo-publish	0s
guide-push-to-deploy	0s
	35m 47s

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