docs: update intro page styling and fix Get Started link

- Change hero subtitle to Poppins bold + underline (simpler, matches site)
- Remove unused font imports (Dancing Script, Caesar Dressing, etc.)
- Fix Get Started link to point to install.md
- Remove pre-alpha warning banner

Co-authored-by: Claude <[email protected]>

Author: nikomatsakis

md/introduction.md

@@ -1,12 +1,11 @@
 <center>
     <img src="./artwork/symposium5_vase-ferris.svg" alt="Symposium Logo" width="50%"/>
-    <div class="warning-banner">⚠️ Pre-alpha software: may eat your laundry</div>
     <br>
     <div class="hero-subtitle">AI the Rust Way</div>
     <div class="action-links">
         <a href="./about.md" class="action-link">About</a>
         <span class="separator">⁄</span>
-        <a href="./get-started" class="action-link">Get started</a>
+        <a href="./install.md" class="action-link">Get started</a>
         <span class="separator">⁄</span>
         <a href="./contribute.md" class="action-link">Contribute</a>
     </div>

theme/custom.css

@@ -1,4 +1,4 @@
-@import url("https://fonts.googleapis.com/css2?family=Dancing+Script:wght@400;700&family=Lato:wght@300;400;500;700&family=Open+Sans:wght@300;400;500;600&family=Poppins:wght@400;500;600;700&display=swap");
+@import url("https://fonts.googleapis.com/css2?family=Lato:wght@300;400;500;700&family=Open+Sans:wght@300;400;500;600&family=Poppins:wght@400;500;600;700&display=swap");
 
 body {
     font-family: "Lato", sans-serif;
@@ -22,9 +22,13 @@ h6 {
 }
 
 .hero-subtitle {
-    font-family: "Dancing Script", cursive;
-    font-size: 4rem;
-    font-weight: 400;
+    font-family: "Poppins", sans-serif;
+    font-size: 3rem;
+    font-weight: 700;
+    letter-spacing: 0.2em;
+    text-transform: uppercase;
+    text-decoration: underline;
+    text-underline-offset: 0.3em;
     margin: 0.5rem 0 2rem 0;
     color: #666;
 }