Include Info about Dev setup feature in contributing.md and and within app

[Dayvvo]

In order to provide a smoother experience in Dev mode I would suggest the following:

• Include a summary on the dev setup features such as the RPC terminal and block explorer as well as instructions on how to access them using the dev setup page in the Contributing file. This would provide more clarity on navigating the app and executing actions that require the Jam RPC terminal or the Jam block explorer in dev mode.

• Include hints about the dev setup at certain points within the app. e.g. After using the "Send" feature to make a transfer. The app warns that "a collaborative transaction requires a 5-block confirmation before that UTXO is usable again". Including a hint in that warning message that blocks can be mined to your address in dev mode using the Jam RPC i.e generatetoaddress 5 "Your address" to confirm the transaction

[theborakompanioni]

Hey @Dayvvo.

Good ideas. There are certain pages where some info is present when running in dev mode, so this should be fine 👍
Thanks so much for the suggestions.