* Add an option to pass env file to deploy command
* Use env variable mapping in fixturenet-optimism stack
* Use default values from checked in env files
* Use env variable mapping in mobymask-v2 stack
* Update instructions
* Add extra hosts in app compose files and update instructions
* Add CERC prefix to env variables in fixturenet-optimism stack
* Add CERC prefix to env variables in mobymask-v2 stack
Former-commit-id: 6b62247ef7a32e20e55c529afa0b80fadb6873a1
* Check existing L1 contracts deployment
* Rename volume used for generated L2 config
* Check for existing L2 geth data directory
* Cross check existing L2 config against L1 deployment config
* Verify sequencer key in existing L2 geth data directory
* Add instructions to troubleshoot corrupt L2 geth dir
* Separate out instructions to run L2 with external L1
* Update docs
Former-commit-id: 9ffa9bb5a97b454da76c8cdeb1722109ce430b53
