Update docs for Holochain 0.3

[pdaoust]

• Update scaffolding flow and output samples
• Update code samples
• Change language that talks about Launcher using Tauri
• A few prose reorganisations to make it flow better with the new scaffolding flow
• Language tweaks, esp around hc spin and hc launch
• Fix broken link
• Add mention of p2p Shipyard

[ThetaSinner]

Looks great! A few minor comments which may or may not be useful :)

[ThetaSinner]

I don't know what other people know around Holo know but I think Svelte is probably a bit less well known in general? I wonder if we should consider switching to the React template now that's available. React, Angular and Vue top the popularity charts, in that order. So we have a better chance of somebody knowing what they're looking at with React

[c12i]

I second this, mostly because of the fact that we are also transitioning to a new styling system, which is already reflected in the react template

[pdaoust]

yeah, for that reason alone @c12i I think it'd be worth switching -- less stuff to delete when you start editing the templates :) But also if React is still more popular, that makes sense too. (I don't know what the kids are using these days 😅 )

So I'll start working on a new PR for that, cuz it's a bigger project -- new screenshots etc.

[matthme]

Looks good to me too 👍

[c12i]

I second this, mostly because of the fact that we are also transitioning to a new styling system, which is already reflected in the react template