Redo documentation

[jlewi]

Redo the information hierarchy to be more sensible

• We had a lot of top level documentation (e.g. how to use Anthropic or Ollama) move this one layer deep into How Tos
• This creates more consistent layout as now all pages are now at least one level deep in the hierarchy rather than being at the first layer

Get rid of some sections

• Reference there was no useful information in the FAQ so just delete
• Use-Cases this only contained the email example. This example is no longer particularly relevant now that we are focusing more on operating on software. I also don't think the document does a good job of explaining/showing how to use Foyle. Its more about a specific CLI gctl.

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