docs: updates to Cache Components Caching

[icyJoseph]

• Questions kept coming up about where use cache results actually live, and how static shells, App Shells, and ISR relate
  • the answers were spread across several pages, but not tied together on the getting-started guide
• The runtime prefetching example also implied cookie data needs allow-runtime, when the App Shell already carries session data
  • allow-runtime is really about URL data.

Changes (docs/app/getting-started/caching)

• Reworked the Usage intro to lead with the cache lifetime concept and hand off to Prerendering
• Added a Where cached content is stored section: server cache, remote handler, and browser, framed around a cached result being a serialized payload that travels to each.

  • if I had time to make it shorter, I would...

  • We will most likely have a visual aid there and trim it down
• Added a static shell ↔ App Shell explanation in Prerendering, and a short Incremental Static Regeneration pointer to the ISR guide
• Corrected the runtime prefetching section to the URL-data model (searchParams/params)
  • replaced the cookie example with a /search one that actually needs allow-runtime.
• catchError (stabilized).
• Cross-linked stale/revalidate/expire to cacheLife
• reviewed and fixed the code-block highlights.

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