Add empty content data that is mapped to templates

frontend/content/blog.go

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+package content
+
+// Blog content data
+type Blog struct {
+	_ interface{} `template:"blog.go.tmpl"`
+}

frontend/content/error.go

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+package content
+
+// Error content data
+type Error struct {
+	_ interface{} `template:"error.go.tmpl"`
+}

frontend/content/index.go

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+package content
+
+// Index content data
+type Index struct {
+	_ interface{} `template:"index.go.tmpl"`
+}