Allow community members to register their nodes using NFT

[nionis]

Description

Once the NFT is sent to the community members, they still need to register their staking address and HOPR address.

Background can be found here: https://github.com/hoprnet/hoprnet/blob/master/NETWORK_REGISTRY.md
and in this Google doc

Registration can currently be done via a script when starting a node (example), or by directly interacting with the smart contract, but this is advanced and cumbersome for most users.

Instead, a simple web UI should be created at network-registry.hoprnet.org where people can connect their wallet and register their HOPR peer ID.

UX flow

The tool will:

• Check that the wallet address has a network registry NFT either staked in the staking contract or unstaked
• If it is unstaked it will stake it
• Provide two fields for the user's HOPR node's xDAI address and peerID
• Throw a warning if the user enters their staking address in this field by mistake (optional but maybe useful)
• Register the chosen peer ID to the network registry
• Send mHOPR and 0.1 xDAI to the HOPR node xDAI address

Relevant issues

Later versions may want to include more feedback, for example a confirmation of deregistration if a user already has a peerID registered and their NFT only allows a single address to be registered.

Although network-registry.hoprnet.org will be the preferred way to register addresses, we should also document the other options mentioned in the description.

Definition of DONE

When the registration tool is live at network-registry.hoprnet.org and is tested and shown to work.

[thewanderingeditor]

Added more information about expected flow of participation, including sending mHOPR, as discussed in devrel call on Tuesday 5th September

[nionis]

You may close this issue once it's completed