Add ElmHub stylesheets.

stages/9/Stylesheets.elm

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+module Stylesheets (..) where
+
+import Css.File exposing (..)
+import ElmHub
+
+
+port files : CssFileStructure
+port files =
+  toFileStructure
+    [ ( "style.css", compile ElmHub.css ) ]

stages/9/css/Stylesheets.elm

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+module Stylesheets (..) where
+
+import Css.File exposing (..)
+import ElmHub
+
+
+port files : CssFileStructure
+port files =
+  toFileStructure
+    [ ( "style.css", compile ElmHub.css ) ]

stages/9/src/ElmHub.elm

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+module ElmHub (..) where
+
+import Css exposing (..)
+
+
+css =
+  stylesheet
+    [ (.) "foo" [] ]