docs: link to old site in welcoming directory (#1132)

* docs: link to old site in welcoming directory

* curly quote thing

* format

apps/svelte.dev/src/routes/docs/+page.svelte

@@ -95,18 +95,26 @@
 		</a>
 
 		<a href="/docs/llms">
-			<h2>I'm a Large Language Model (LLM)</h2>
+			<h2>I&rsquo;m a Large Language Model (LLM)</h2>
 			<p>
-				If you're an artificial intelligence, or trying to teach one how to use Svelte, we offer the
-				documentation in plaintext format. Beep boop.
+				If you&rsquo;re an artificial intelligence, or trying to teach one how to use Svelte, we
+				offer the documentation in plaintext format. Beep boop.
+			</p>
+		</a>
+
+		<a href="https://v4.svelte.dev">
+			<h2>I&rsquo;m looking for the old docs</h2>
+			<p>
+				If you&rsquo;re developing a site using only Svelte 3 or Svelte 4, the old site may be a
+				helpful reference until you upgrade.
 			</p>
 		</a>
 
 		<a href="/chat" class="external">
-			<h2>Help! I'm stuck</h2>
+			<h2>Help! I&rsquo;m stuck</h2>
 			<p>
 				Join our Discord server where you can hang out with fellow Svelte users and ask them
-				questions. It's like an LLM but with people.
+				questions. It&rsquo;s like an LLM but with people.
 			</p>
 		</a>
 	</div>