Add package.json to docs for local mint dev dependency (#141)

* Add package.json to docs for local mint dev dependency

Allow installing mint as a local dev dependency instead of requiring
a global install, making the setup more reproducible.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Use npx mint dev to avoid mint version bug

Address PR review feedback: the mint package has a bug that causes it
to use the wrong version when installed as an npm dependency. Switch to
npx mint dev, remove the devDependency and package-lock.json, and
simplify docs accordingly.

* Move `package.json` to repo root and clean up docs

Move the `package.json` from `docs/` to the repo root so `npm run dev`
works from anywhere in the repository. Update `CLAUDE.md` instructions
to match, trim boilerplate from `docs/README.md`, and link to the live
documentation site.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Jonathan Hefner <jonathan@hefner.pro>

package.json

@@ -0,0 +1,7 @@
+{
+  "name": "agentskills",
+  "private": true,
+  "scripts": {
+    "dev": "cd docs && npx mint dev"
+  }
+}