Fix XSS vulnerabilities in jQuery (#105)

* Fix jQuery XSS vulnerabilities by upgrading to 3.7.1

- Updated jQuery from 1.11.0/3.5.0 to 3.7.1 across all templates
- Removed vulnerable local jquery.js file (v1.11.0)
- Changed fallback from local file to code.jquery.com CDN
- Fixes XSS vulnerabilities in jQuery as detected in security scan

This addresses the following moderate severity XSS issues:
- XSS in jQuery as used in Drupal, Backdrop CMS, and other products
- Cross-Site Scripting (XSS) in jquery
- Potential XSS vulnerability in jQuery

* build

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: yonidavidson

docs/index.html

@@ -287,8 +287,8 @@ <h1>Code Of Conduct</h1>
 
     </div>
 
-    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
-    <script>window.jQuery || document.write('<script src="https://www.gophercon.org.il/js/jquery.js"><\/script>')</script>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
+    <script>window.jQuery || document.write('<script src="https://code.jquery.com/jquery-3.7.1.min.js"><\/script>')</script>
 
 
 <script type="application/javascript">

layouts/index.html

@@ -43,8 +43,8 @@
 
     </div>
 
-    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
-    <script>window.jQuery || document.write('<script src="/js/jquery.js"><\/script>')</script>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
+    <script>window.jQuery || document.write('<script src="https://code.jquery.com/jquery-3.7.1.min.js"><\/script>')</script>
     {{ if isset .Site.Params "address" }}
     {{ with .Site.Params.GoogleMapsKey }}
     <script src="https://maps.google.com/maps/api/js?key={{ . }}"></script>

themes/hugo-conference/layouts/index.html

@@ -40,8 +40,8 @@
     </div>
   </div>
 
-  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
-  <script>window.jQuery || document.write('<script src="/js/jquery.js"><\/script>')</script>
+  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
+  <script>window.jQuery || document.write('<script src="https://code.jquery.com/jquery-3.7.1.min.js"><\/script>')</script>
   {{ if isset .Site.Params "address" }}
   {{ with .Site.Params.GoogleMapsKey }}
   <script src="https://maps.google.com/maps/api/js?key={{ . }}"></script>