Add repository-driven site theme

.theme/templates/sections/articles.liquid

@@ -0,0 +1,22 @@
+<section class="page-intro">
+  <p class="eyebrow">Writing</p>
+  <h1>{{ page.title }}</h1>
+  {% if page.summary %}
+    <p class="lede">{{ page.summary }}</p>
+  {% endif %}
+</section>
+
+<section class="listing" aria-label="{{ page.title }}">
+  {% for item in collection.items %}
+    <article class="listing-item">
+      <div>
+        <p class="card-kind">{{ item.contentModel }}</p>
+        <h2><a href="{{ item.route }}">{{ item.title }}</a></h2>
+        <p>{{ item.summary }}</p>
+      </div>
+      <a class="text-link" href="{{ item.route }}" aria-label="Read {{ item.title }}">Read <span aria-hidden="true">→</span></a>
+    </article>
+  {% else %}
+    <p class="empty-state">No articles have been published yet.</p>
+  {% endfor %}
+</section>

.theme/templates/sections/projects.liquid

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+<section class="page-intro">
+  <p class="eyebrow">Projects</p>
+  <h1>{{ page.title }}</h1>
+  {% if page.summary %}
+    <p class="lede">{{ page.summary }}</p>
+  {% endif %}
+</section>
+
+<section class="card-grid" aria-label="{{ page.title }}">
+  {% for item in collection.items %}
+    <article class="card project-card">
+      <p class="card-kind">{{ item.contentModel }}</p>
+      <h2><a href="{{ item.route }}">{{ item.title }}</a></h2>
+      <p>{{ item.summary }}</p>
+      {% if item.tags.size > 0 %}
+        <ul class="tag-list" aria-label="Technologies and topics">
+          {% for tag in item.tags %}
+            <li>{{ tag }}</li>
+          {% endfor %}
+        </ul>
+      {% endif %}
+      <a class="text-link" href="{{ item.route }}">View project <span aria-hidden="true">→</span></a>
+    </article>
+  {% else %}
+    <p class="empty-state">No projects have been published yet.</p>
+  {% endfor %}
+</section>