Spruce up Getting Started

[aboodman]

• Make it more explicit that we intend for devs to start by forking this repo.
• Add a section introducing the layout of the project.
• Make it explicit that you don't need to understand backend dir immediately.
• Link next to How it Works (which will change soon), not Integration Guide.

[vercel[bot]]

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Name	Status	Preview	Updated
replicache	✅ Ready (Inspect)	Visit Preview	Apr 19, 2022 at 11:52AM (UTC)