Major App and UI docs refactor

[samlown]

• Significant refactor of how popui apps should be defined and used in Go. Defined the following key components:
  • App - basic layout including html, head, and body tags.
  • Main, Header, and Footer - to be used inside app for basic layout using grid CSS.
  • Article - for padded content.
• Moving to using single index for all Go documentation, that itself uses the new popui App layout. Alpine.js to switch between sections. This was determined to be the best option for use with LLMs as it can simply read a single index.html and extract everything it needs.
• Simplifying examples to use real go code instead of mdx copies.
• Examples use a single component index.

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