Minimaizing reliance on hidden header file

Author: Phil Sturgeon

_includes/header.html

@@ -0,0 +1,35 @@
+<header class="site-header" role="banner">
+
+  <div class="wrapper">
+    {%- assign default_paths = site.pages | map: "path" -%}
+    {%- assign page_paths = site.header_pages | default: default_paths -%}
+    <a class="site-title" rel="author" href="{{ "/" | relative_url }}">{{ site.title | escape }}</a>
+
+    {%- if page_paths -%}
+      <nav class="site-nav">
+        <input type="checkbox" id="nav-trigger" class="nav-trigger" />
+        <label for="nav-trigger">
+          <span class="menu-icon">
+            <svg viewBox="0 0 18 15" width="18px" height="15px">
+              <path fill="#424242" d="M18,1.484c0,0.82-0.665,1.484-1.484,1.484H1.484C0.665,2.969,0,2.304,0,1.484l0,0C0,0.665,0.665,0,1.484,0 h15.031C17.335,0,18,0.665,18,1.484L18,1.484z"/>
+              <path fill="#424242" d="M18,7.516C18,8.335,17.335,9,16.516,9H1.484C0.665,9,0,8.335,0,7.516l0,0c0-0.82,0.665-1.484,1.484-1.484 h15.031C17.335,6.031,18,6.696,18,7.516L18,7.516z"/>
+              <path fill="#424242" d="M18,13.516C18,14.335,17.335,15,16.516,15H1.484C0.665,15,0,14.335,0,13.516l0,0 c0-0.82,0.665-1.484,1.484-1.484h15.031C17.335,12.031,18,12.696,18,13.516L18,13.516z"/>
+            </svg>
+          </span>
+        </label>
+
+        <div class="trigger">
+          {%- for path in page_paths -%}
+            {%- assign my_page = site.pages | where: "path", path | first -%}
+            {%- if my_page.title -%}
+            <a class="page-link" href="{{ my_page.url | relative_url }}">{{ my_page.title | escape }}</a>
+            {%- endif -%}
+          {% endfor -%}
+        </div>
+      </nav>
+    {%- endif -%}
+    <a class="page-link" href="https://join.slack.com/t/json-schema/shared_invite/enQtMjk1NDcyNDI2NTAwLTcyYmYwMjdmMmUxNzZjYzIxNGU2YjdkNzdlOGZiNjIwNDI2M2Y3NmRkYjA4YmMwODMwYjgyOTFlNWZjZjAyNjg">
+      Discussion
+    </a>
+  </div>
+</header>