Revision of the top half of the introduction page

[GBKS]

Trying to address the feedback we got in the reading session:

• Make the first few lines a bit more motivating and sell the dream better
• Also make them less abstract (what does "foster innovation" mean?)
• There's also now a bit in there about who the guide is for
• Condense some of the content that felt repetitive

I think this gets us closer to where we want to be, but is not the ultimate yet. But now we should be able to revise line by line, instead of broader or more structural content changes.

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