Review of README & onboarding

[zramsay]

for #1650, these are some notes about onboarding, mostly WRT to the README

General Points:

• readme is somewhat overwhelming; too many emojis & details that would be better in seperate docs
• it isn't clear the distinction between what a user and developer should do ... link to download binary isn't top and centre (when it should be, I think, most people coming to this repo probably want to only do just that
• again blurring the line between user and dev, the readme suggests even a user needs to install docker
• yarn is explained after a handful of commands, same with the git clone
• whats up with versioning? 0.10.4 then 0.8001.1 ?
• the list of environment variable should be moved into a seperate doc and better explained.

Summary:

• the README can be significantly re-organized, and some structure to added to developer / user documentation

Specific Points:

• readme says "No Active Testnet, must run a local node to test Voyager out" but after downloading binary, starting the app, and going through the first few steps, the bottom left icon tell me i'm connected to 8001
• it's not clear how to connect to a local testnet ... i tried various approaches, the most promising being "Offline Mode" from Settings, which prompts me to create a default account (the purpose of this account is unclear, ive already created on to start my localnet) ... and don't I have to run a local node for Voyager to connect to? shouldn't Voyager tell me its trying to connect to a local node and failing? Turns out (I think) that offline mode is really just "we pre-loaded some stuff for you, there isn't actually a running blockchain" whereas the README would lead one to believe that "Offline mode" is meant for testing using a local node. This should be documented somewhere.
• I'm not able to change "Node IP" in either Offline Mode or Live Testnet, why not? I want to select the seed to connect to. How do I connect to a different testnet if I can't change the NodeIP?

Summary:

• there's inconsistencies between the readme and the app which make navigating / using it confusing & i wasn't able to test all the features. Perhaps I'm missing a critical feature / option but I couldn't connect Voyager to a local gaiad chain.