Be smarter about linking to posts on home page.

Fixes #50

Hugo's `.Summary` did not behave as I expected it to, not stripping out
HTML, so I removed the anchor block from around the posts and moved the
links to the image, title and a read more button.

layouts/partials/summary-with-image.html

@@ -1,22 +1,29 @@
 {{ $featured_image := .Params.featured_image }}
 <article class="bb b--black-10">
-  <a class="db pv4 ph3 ph0-l no-underline dark-gray dim" href="{{ .URL }}">
+  <div class="db pv4 ph3 ph0-l no-underline dark-gray">
     <div class="flex flex-column flex-row-ns">
       {{ if .Params.featured_image }}
           {{/* Trimming the slash and adding absURL make sure the image works no matter where our site lives */}}
         {{ $featured_image := (trim $featured_image "/") | absURL }}
         <div class="pr3-ns mb4 mb0-ns w-100 w-40-ns">
-          <img src="{{ $featured_image }}" class="db" alt="image from {{ .Title }}">
+          <a href="{{.URL}}" class="db grow">
+            <img src="{{ $featured_image }}" class="img" alt="image from {{ .Title }}">
+          </a>
         </div>
       {{ end }}
-      <div class="w-100{{ if .Params.featured_image }} w-60-ns pl3-ns{{ end }}">
-        <h1 class="f3 fw1 athelas mt0 lh-title">{{ .Title }}</h1>
-        <div class="f6 f5-l lh-copy nested-copy-line-height">
+      <div class="blah w-100{{ if .Params.featured_image }} w-60-ns pl3-ns{{ end }}">
+        <h1 class="f3 fw1 athelas mt0 lh-title">
+          <a href="{{.URL}}" class="color-inherit dim link">
+            {{ .Title }}
+            </a>
+        </h1>
+        <div class="f6 f5-l lh-copy nested-copy-line-height nested-links">
           {{ .Summary }}
         </div>
+          <a href="{{.URL}}" class="ba b--moon-gray bg-light-gray br2 color-inherit dib f7 hover-bg-moon-gray link mt2 ph2 pv1">{{$.Param "read_more_copy" | default "read more" }}</a>
         {{/* TODO: add author
         <p class="f6 lh-copy mv0">By {{ .Author }}</p> */}}
       </div>
     </div>
-  </a>
+  </div>
 </article>