feat: add intro, quickstart, architecture

[paulleseute]

First 3 pages of the doc revamp. WIP, since it misses illustration and references to pages that do not exist yet. Reworked the filetree a bit to reflect the table of content.

Greptile Summary

This PR adds the first three documentation pages of the revamp (introduction, quickstart, and architecture) under a new get-started/ directory, and updates docs.json navigation accordingly while removing the old home.mdx.

• introduction.mdx and architecture.mdx are well-structured with clear explanations, Mermaid sequence diagrams, and working code examples.
• quickstart.mdx walks users through scaffold → local dev → tunnel → deploy but has a malformed CodeGroup in the tunnel section (missing closing fence for the npm block) that will break the rendered output for that entire step.
• docs.json navigation is updated correctly; a /home → /get-started/introduction redirect (flagged in a prior review) is still absent.

Confidence Score: 4/5

Safe to merge after fixing the broken CodeGroup fence in quickstart.mdx; the rest of the content is clean.

The tunnel section of quickstart.mdx has a missing closing code fence for the npm block. The CodeGroup will render incorrectly, meaning users following the guide to expose their local server will see garbled or missing instructions rather than a clear command to copy.

docs/get-started/quickstart.mdx — the tunnel CodeGroup around line 69–83 needs the missing closing fence added before the pnpm block.

Comments Outside Diff (1)

1. docs/docs.json, line 193-222 (link)

   Missing redirect for deleted /home page

   docs/home.mdx has been removed and its navigation slot replaced by get-started/introduction. Without a corresponding redirect entry, any existing external links, search-engine-indexed URLs, or user bookmarks pointing to /home will land on a 404. The existing redirects block is the right place to add { "source": "/home", "destination": "/get-started/introduction" }.

   Prompt To Fix With AI

   This is a comment left during a code review.
   Path: docs/docs.json
   Line: 193-222
   
   Comment:
   **Missing redirect for deleted `/home` page**
   
   `docs/home.mdx` has been removed and its navigation slot replaced by `get-started/introduction`. Without a corresponding redirect entry, any existing external links, search-engine-indexed URLs, or user bookmarks pointing to `/home` will land on a 404. The existing redirects block is the right place to add `{ "source": "/home", "destination": "/get-started/introduction" }`.
   
   How can I resolve this? If you propose a fix, please make it concise.

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
docs/get-started/quickstart.mdx:69-71
The npm code fence opened on line 69 is never closed before the next ` ```bash pnpm ` fence starts on line 71. As written, the raw markdown is malformed — most renderers will either swallow everything through the `</CodeGroup>` tag into a single giant code block or surface a parsing error, leaving users unable to copy the correct tunnel command.

```suggestion
```bash npm
npm run dev -- --tunnel
```
```bash pnpm
```

_{Reviews (2): Last reviewed commit: "Update docs/get-started/quickstart.mdx" | Re-trigger Greptile}

[harijoe]

Looks neat.
It's worth asking a LLM to review the english to make sure it's 100% natural, but overall very nice

[harijoe]

Why not using word devtools instead of local emulator?