add syscall article

templates/shortcodes/note.html

@@ -0,0 +1,12 @@
+<blockquote class="note">
+    {% set icon = load_data(path="static/images/info.svg") %}
+    <div class="icon">
+        {{ icon | safe }}
+    </div>
+    <div class="content">
+        {% if header %}
+        <p><strong>{{ header }}</strong></p>
+        {% endif %}
+        {{ body | markdown | safe }}
+    </div>
+</blockquote>