add tella theme

themes/tella/layouts/partials/summary.html

@@ -0,0 +1,18 @@
+<div
+  class="sans w-full px-2 lg:max-w-full lg:flex mt-3 lg:px-0 duration-500 transform hover:-translate-y-1 hover:shadow-md">
+  {{ if .Params.image }}
+  <img id="thumb" alt="{{.Title}}" class="aspect-video object-cover w-auto lg:h-44"
+    src="{{ .Params.image | relURL }}" />
+  {{ else }}
+  <img id="thumb" alt="{{.Title}}" class="aspect-video object-cover w-auto lg:h-44"
+    src='{{ "/img/default.jpg" | relURL }}'>
+  {{ end }}
+  <div
+    class="border-r border-b border-l border-gray-400 lg:border-l-0 lg:border-t lg:border-gray-400 relative pl-4 p-6 justify-between leading-normal max-w-full w-full">
+    <div class="text-gray-900 font-bold text-xl mb-2">{{ .Title }}</div>
+    <p class="text-gray-700 text-base pb-5">{{ substr .Summary 0 130 | plainify | htmlUnescape }}...</p>
+    <p class="text-sm text-gray-600 items-center">
+      <time>{{ .Date.Format "2006/01/02" }}</time>
+    </p>
+  </div>
+</div>