feat(header): add GitHub icon button to header

Author: lzwjava

_includes/github-icons.html

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+    <path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37 0 0 0-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44 0 0 0 20 4.77 5.07 5.07 0 0 0 19.91 1S18.73.65 16 2.48a13.38 13.38 0 0 0-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07 0 0 0 5 4.77a5.44 5.44 0 0 0-1.5 3.78c0 5.42 3.3 6.61 6.44 7A3.37 3.37 0 0 0 9 18.13V22"/>
+</svg>
+
+

_includes/header.html

@@ -17,6 +17,10 @@ <h3 class="project-tagline">{{ page.description | default: site.description | de
     <button id="searchHeader" class="icon-button" aria-label="Search" onclick="window.location.href='/search-en'">
       {% include search-icons.html %}
     </button>
+    
+    <button id="githubHeader" class="icon-button" aria-label="GitHub" onclick="window.location.href='https://github.com/lzwjava/lzwjava.github.io'">
+      {% include github-icons.html %}
+    </button>
 
     <!-- <button id="statusHeader" class="icon-button" aria-label="Check Status"
       onclick="window.location.href='/status-page-en'">