Big edit, added Poultry Highway post and various media

layouts/shortcodes/image.html

@@ -0,0 +1,5 @@
+<img src="{{ .Get "src" }}" 
+     alt="{{ .Get "alt" | default "Image" }}" 
+     {{ with .Get "class" }}class="{{ . }}"{{ end }} 
+     {{ with .Get "width" }}width="{{ . }}"{{ end }} 
+     {{ with .Get "height" }}height="{{ . }}"{{ end }} />

layouts/shortcodes/video.html

@@ -1,5 +1,5 @@
-<div class="video-container" style="text-align: center; margin: 20px 0;">
-    <video controls preload="metadata" width="{{ .Get "width" | default "100%" }}" style="max-width: 100%; height: auto; border-radius: 4px;">
+<div class="video-container" style="text-align: center; margin: auto;">
+    <video controls preload="metadata" width="{{ .Get "width" | default "100" }}" style="max-width: 100%; height: auto; border-radius: 4px;">
         <source src="{{ .Get "src" }}" type="video/mp4">
         Your browser does not support the video tag.
     </video>