feature: add ability to modify a deploy alias

[barriebyron]

Right now, the zkApp CLI creates a deploy alias with zk config https://docs.minaprotocol.com/zkapps/tutorials/deploying-to-a-network#deploy-alias

However, we are unable to modify an existing deploy alias

It's likely that developers will want to modify existing deploy aliases as they iterate on their development

Enhancement suggestion: add the ability to modify an existing deploy alias (present the current values and change only the ones you want to change)

[mitschabaude]

fwiw you can modify an existing alias by changing the config.json

[barriebyron]

@ymekuria wdyt about documenting the config.json file and adding docs that describe this modify step?

version | 1
-- | --
deployAliases |  
berkeley |  
url | "https://proxy.berkeley.minaexplorer.com/graphql"
keyPath | "keys/berkeley.json"
feepayerKeyPath | "/Users/barriebyron/.cache/zkapp-cli/keys/03-deploy2.json"
feepayerAlias | "03-deploy"
fee | "0.1"
smartContract | "Square"

[barriebyron]

feedback from Ivan at MF presents an attractive option:

If I want to change an existing deploy config, for example alias or endpoint - I should do it manually or create a new one? Would be great to have smth like “zk config set url=”