Additional documentation required

[grctest]

At the moment the documentation covers the functionality of each page, however the following topics are not yet addressed:

1. Bitshares blockchain info - DPOS / Witnesses / Committee
2. Wallet selection like Beet / BeetEOS / bitshares-light / bitshares-ui
3. External links to gateways, awesome-bitshares, forums, chat rooms
4. GitHub links
5. Debugging steps - what to do if an operation fails to broadcast
6. How to get a new gateway asset added