docs: Reformat external provider documentation (#2982)

**Description** 
This PR adjusts the external providers documentation to align with the
new providers format. Splits up sections into the existing external
providers and how to create them as well.

<img width="1049" height="478" alt="Screenshot 2025-07-31 at 9 48 26 AM"
src="https://github.com/user-attachments/assets/f13599cb-2fd1-4e57-8ca9-27b067264e33"
/>

Open to feedback and adjusting titles
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Kelly Brown 2025-07-31 12:21:13 -04:00 committed by GitHub
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commit 8a6c0fb930
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4 changed files with 65 additions and 56 deletions

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@ -15,7 +15,7 @@ Importantly, Llama Stack always strives to provide at least one fully inline pro
```{toctree}
:maxdepth: 1
external
external/index
openai
inference/index
agents/index