Add pi-llama plugin install step; enable prettier format-on-save

- Add explicit `pi install github.com/huggingface/pi-llama` step to the
  llama+pi quick-start so users install the plugin before running `pi`.
- Configure VS Code to format on save with Prettier (including for
  Svelte files), which accounts for the line-wrap reflow in +page.svelte.

Author: julien-c

.vscode/settings.json

@@ -1,5 +1,10 @@
 {
 	"files.associations": {
 		"*.css": "tailwindcss"
+	},
+	"editor.formatOnSave": true,
+	"editor.defaultFormatter": "esbenp.prettier-vscode",
+	"[svelte]": {
+		"editor.defaultFormatter": "esbenp.prettier-vscode"
 	}
 }

src/routes/+page.svelte

@@ -54,7 +54,9 @@
 	let copied = $state(false);
 	let isWindows = $state(false);
 	const installCommand = $derived(
-		isWindows ? 'irm https://llama.app/install.ps1 | iex' : 'curl -LsSf https://llama.app/install.sh | sh'
+		isWindows
+			? 'irm https://llama.app/install.ps1 | iex'
+			: 'curl -LsSf https://llama.app/install.sh | sh'
 	);
 
 	$effect(() => {
@@ -155,7 +157,10 @@
 					><span class="opacity-50"># 1. Serve a model</span>
 llama serve
 
-<span class="opacity-50"># 2. Run Pi, it will autodiscover it</span>
+<span class="opacity-50"># 2. Install the pi-llama plugin</span>
+pi install github.com/huggingface/pi-llama
+
+<span class="opacity-50"># 3. Run Pi, everything is set</span>
 pi</code
 				></pre>
 			<div