Add linter script

Fix issue with running `cd src/handbook` while in the handbook directory for building

.github/workflows/handbook.yml

@@ -74,7 +74,7 @@ jobs:
         run: npm install
       - name: Build handbook
         working-directory: src/handbook
-        run: cd src/handbook && npm run build
+        run: npm run build
       - name: Upload build
         uses: actions/upload-artifact@v3
         with:

src/handbook/package.json

@@ -8,7 +8,9 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+
+    "lint": "npx prettier --write \"src/handbook/**/*.{ts,tsx,js,jsx,json,md}\""
   },
 
   "dependencies": {