new approach

views/error.pug

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+extends layout
+
+block content
+  h1= message
+  h2= error.status
+  pre #{error.stack}

views/index.pug

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+extends layout
+
+block content
+  h1 ServiceDock
+  div#main

views/layout.pug

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+doctype html
+html
+  head
+    title= title
+    link(rel='stylesheet', href='/stylesheets/style.css')
+    script(type="text/javascript", src="/jquery.min.js")
+    script(type="text/javascript", src="/viz.js")
+    script(type="text/javascript", src="/docker.js")
+    script(type="text/javascript", src="/servicedock.js")
+  body
+    block content