Dev & production mode

[cjslep]

From #56 by @aschrijver:

6. Dev / Prod mode

Related to 5. Bootstrapping. For the example the CLI configuration needs a certificate for localhost. But if I use develop a GoFed based app, I want to have both Dev and Prod modes at my disposal (test/debug locally, deploy to CI pipeline for prod). In that case config.ini needs a range of different settings, or I need to have separate config.ini files (might be better).