Add single layout stylesheets for all content types

Ensure that every content type has its own stylesheet even if it's blank otherwise you'll get 404 errors

layouts/image/single.html

@@ -1,5 +1,4 @@
 {{ partial "header" . }}
-<style>body { background-color: #fff; color: black; }</style>
 {{ partial "image" . }}
 {{ partial "postmeta" . }}
 {{ partial "footer" . }}

layouts/video/single.html

@@ -1,5 +1,4 @@
 {{ partial "header" . }}
-<style>body { background-color: black; color: white; }</style>
 {{ partial "video-embed" .Params.embed_url }}
 {{ .Content }}
 {{ partial "postmeta" . }}

static/css/image.css

@@ -0,0 +1,8 @@
+body {
+  background-color: #fff;
+  color: black;
+}
+
+h1#site-title a, h1#site-title a:visited, h1#site-title a:hover {
+  color: #eee;
+}

static/css/post.css

@@ -9,5 +9,5 @@ h1, h2, h3 {
 }
 
 h1#site-title a, h1#site-title a:visited, h1#site-title a:hover {
-  color: #777;
+  color: #ccc;
 }

static/css/video.css

@@ -0,0 +1,4 @@
+body {
+  background-color: black;
+  color: white;
+}