Use of deprecated config keys org.identity and dataexchange.https

[peterbroadhurst]

A few releases back (can't remember exactly when) this config was deprecated:

firefly-cli/internal/core/firefly_config.go

Line 71 in 03797a8

Identity string `yaml:"identity,omitempty"`

It's now org.key.
Would be good for the CLI to switch over, as it will print a warning on every start up that the old config is used.

Note that the same is now true in v0.13.0 for dataexchange.https here (now dataexchange.ffdx):

firefly-cli/internal/core/firefly_config.go

Line 105 in 03797a8

HTTPS *HttpEndpointConfig `yaml:"https,omitempty"`