Reorganize partials

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

layouts/partials/posts/hero.html

@@ -1,9 +0,0 @@
-<section class="hero">
-  <h1>{{ .Title }}</h1>
-  <div class="meta">
-    <span class="date">{{ .Date | time.Format ":date_medium" }}</span>
-    &middot;
-    <span class="duration">{{ printf "%d MIN READ" .ReadingTime }}</span>
-  </div>
-  {{ partial "image/index.html" .Params.hero }}
-</section>