Add RenderCommand abstraction and cleanup pipeline generation in prep… #10

Job	Run time
nix-fmt-check	41s
cargo (cargo fmt --verbose --all -- --check)	24s
nix-flake-check (ubuntu-latest)	21s
cargo (cargo check --locked --workspace)	24s
nix-flake-check (macos-latest)	1m 29s
cargo (cargo check --locked --examples --workspace)	28s
cargo (cargo test --locked --lib --bins --all-features --workspace)	23s
cargo (cargo doc --locked --all-features --workspace)	23s
cargo (cargo test --locked -p nannou_core --no-default-features --features "libm serde")	23s
cargo (cargo build --locked -p nannou --features "wasm-experimental" --target wasm32-unknown-unkn...	24s
cargo (mdbook build guide/)	22s
cargo (cargo test --locked -p book_tests)	23s
verifications	0s
cargo-publish	0s
guide-push-to-deploy	0s
	6m 5s

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