some cleanup, add skeleton of zola based website

site/templates/_variables.html

@@ -0,0 +1,15 @@
+<style>
+    :root {
+        /* Primary theme color */
+        --primary-color: #202024;
+        /* Primary theme text color */
+        --primary-text-color: #808070;
+        /* Primary theme link color */
+        --primary-link-color: #8080a0;
+        /* Secondary color: the background body color */
+        --secondary-color: #e4dfd7;
+        --secondary-text-color: #303030;
+        /* Highlight text color of table of content */
+        --toc-highlight-text-color: #d46e13;
+    }
+</style>

site/templates/index.html

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+{% extends "juice/templates/index.html" %}
+{% block hero %}
+    <div>
+        <section>
+            <h1 class="text-center heading-text">A WebAssembly based sizecoding platform</h1>
+        </section>
+        <a href="v0.1pre1">
+            <div class="demonstration-gif" style="width:640px;height:512px;background-color:black"></div>
+        </a>
+    </div>
+{% endblock hero %}
+
+{% block footer %}
+{% endblock footer %}