feat: update README and add GitHub links in header and license section

index.html

@@ -55,6 +55,9 @@
         <span class="icon-moon" data-i18n="theme.dark">Dark Theme</span>
         <span class="icon-sun" data-i18n="theme.light">Light Theme</span>
       </button>
+      <a href="https://github.com/CNCKitchen/stlTexturizer" target="_blank" rel="noopener noreferrer" class="github-link" title="GitHub Repository" aria-label="GitHub Repository">
+        <svg width="20" height="20" viewBox="0 0 16 16" fill="currentColor"><path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27s1.36.09 2 .27c1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.01 8.01 0 0 0 16 8c0-4.42-3.58-8-8-8Z"/></svg>
+      </a>
     </div>
   </header>
 
@@ -380,6 +383,7 @@
         <li data-i18n-html="license.item6">The author shall not be held <strong>liable</strong> for any damages, data loss, or issues arising from the use of this tool.</li>
         <li data-i18n-html="license.item7">Want to license or embed this tool for your own business or website? Contact us at <a href="mailto:contact@cnckitchen.com">contact@cnckitchen.com</a>.</li>
         <li data-i18n-html="license.item3">Support this tool? Shop at <a href="https://geni.us/CNCStoreTexture" target="_blank" rel="noopener">CNCKitchen.STORE</a> or donate on <a href="https://www.paypal.me/CNCKitchen" target="_blank" rel="noopener">PayPal</a>.</li>
+        <li data-i18n-html="license.item8">Source code available on <a href="https://github.com/CNCKitchen/stlTexturizer" target="_blank" rel="noopener">GitHub</a>.</li>
       </ul>
     </div>
   </div>