Document offline mode #3618

Job	Run time
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 11s
Build & test (plutus-cbor)	1m 27s
Build specification using nix	1m 22s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 19s
Build & test (plutus-merkle-tree)	1m 24s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/3-nodes.cbor datasets/1-node.cbor --outpu...	8m 20s
Build haddock using nix	5m 30s
Build & test (hydra-plutus)	1m 25s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 46s
Build & test (hydra-tui)	5m 39s
Build & test (hydra-node)	7m 16s
Build & test (hydra-cluster)	12m 8s
Publish benchmark results	0s
Publish test results	11s
Documentation	1m 17s
	57m 15s

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