Add ALTCHA widget to main page contact form

The widget was only on the /contact/ page; main page form was unprotected.

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

main-site/index.html

@@ -218,6 +218,14 @@
 
     <div id="formAlert" class="notification" style="display:none;"></div>
 
+    <div class="field">
+      <altcha-widget
+        challengeurl="/api/altcha"
+        style="--altcha-color-border: #dbdbdb; --altcha-border-radius: 4px; --altcha-color-text: #363636;"
+      ></altcha-widget>
+      <p class="help is-danger" id="err-altcha" style="display:none;">Please complete the verification.</p>
+    </div>
+
     <div class="field">
       <div class="control">
         <button type="submit" id="submitBtn" class="button is-info is-fullwidth">Send Message</button>
@@ -313,6 +321,7 @@
     <script src="reviews-data.js"></script>
     <script src="reviews.js?v=6"></script>
     <script src="contact-form.js"></script>
+    <script async src="https://cdn.jsdelivr.net/npm/altcha/dist/altcha.min.js" type="module"></script>
 
 </body>
 </html>