Move _errors Sass from main to base

That way errors are automatically styled on all other apps (Flamenco, Attract...)

src/styles/base.sass

@@ -5,9 +5,11 @@
 @import _apps_base
 @import _notifications
 @import _comments
+@import _error
 
 
 html
+	height: 100%
 	-webkit-font-smoothing: antialiased
 	-moz-osx-font-smoothing: grayscale
 

src/styles/main.sass

@@ -2,14 +2,15 @@
 @import _config
 @import _utils
 
-@import _comments
+/* Generic styles (comments, notifications, etc) come from base.css */
+
+/* Blender Cloud specific styles */
 @import _project
 @import _project-sharing
 @import _project-dashboard
 @import _user
 @import _join
 @import _homepage
-@import _error
 @import _stats
 @import _search
 

src/templates/errors/layout.jade

@@ -2,26 +2,15 @@ doctype
 html(lang="en")
 	head
 		meta(charset="utf-8")
-		title Blender Cloud
+		title Error
 		meta(name="viewport", content="width=device-width, initial-scale=1.0")
-		meta(name="description", content="Blender Cloud is a web based service developed by Blender Institute that allows people to access the training videos and all the data from the past open projects.")
-		meta(name="author", content="Blender Institute")
-		meta(name="theme-color", content="#3e92aa")
-
-		script.
-			!function(e){"use strict";e.loadCSS=function(t,n,o){var r,i=e.document,l=i.createElement("link");if(n)r=n;else{var d=(i.body||i.getElementsByTagName("head")[0]).childNodes;r=d[d.length-1]}var a=i.styleSheets;l.rel="stylesheet",l.href=t,l.media="only x",r.parentNode.insertBefore(l,n?r:r.nextSibling);var f=function(e){for(var t=l.href,n=a.length;n--;)if(a[n].href===t)return e();setTimeout(function(){f(e)})};return l.onloadcssdefined=f,f(function(){l.media=o||"all"}),l},"undefined"!=typeof module&&(module.exports=e.loadCSS)}(this);
-
-			loadCSS( "//fonts.googleapis.com/css?family=Roboto:300,400,500" );
-			loadCSS( "//fonts.googleapis.com/css?family=Lato:300,400" );
 
 		link(href="{{ url_for('static_pillar', filename='assets/ico/favicon.png') }}", rel="shortcut icon")
 		link(href="{{ url_for('static_pillar', filename='assets/ico/apple-touch-icon-precomposed.png') }}", rel="icon apple-touch-icon-precomposed", sizes="192x192")
-
+		link(href="{{ url_for('static_pillar', filename='assets/css/base.css') }}", rel="stylesheet")
 		link(href="{{ url_for('static_pillar', filename='assets/css/main.css') }}", rel="stylesheet")
+		link(href='//fonts.googleapis.com/css?family=Roboto:300,400', rel='stylesheet', type='text/css')
 
 	body.error
 		| {% block body %}{% endblock %}
 
-		noscript
-			link(href='//fonts.googleapis.com/css?family=Roboto:300,400,500', rel='stylesheet', type='text/css')
-			link(href='//fonts.googleapis.com/css?family=Lato:300,400', rel='stylesheet', type='text/css')