Docs: Improves getting started section and fixes typos

[lmac-1]

Hey Nick! Here's a collection of small updates to improve the getting started sections of the docs and also fix a few broken links/typos:

• Fixes broken link in CartProvider
• Removes references to "look at the API below" as the structure of the docs has changed since this was written
• Adds extra context on client only mode about adding products on the Stripe dashboard
• Adds link to Typescript example in GitHub
• Adds comments about price being in smallest currency unit in code examples (this confused me a bit when I was configuring it for the first time)
• Makes all note formatting consistent ("Note")

These are basically some things I noticed or wanted to add after going through the documentation myself for the first time to make it a bit clearer.

Side note: I'm wondering if we should have a section in the documentation linking to the different examples that we have in the code for TypeScript, Next.js etc?

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