Convert docdock theme from submodule to native files and fix Hugo compatibility

themes/docdock/static/scss/original/style.scss

@@ -0,0 +1,16 @@
+// compileNested: ../css/$1.css, sourceMap: true
+ /*
+	Built with SCSS.
+	If you would like to explore this CSS,
+	use source map feature of your browser.
+ */
+
+@import "functions";
+@import "colours";
+@import "fonts";
+@import "variables";
+@import "main";
+@import "sidebar";
+@import "shortcodes";
+@import "responsive";
+@import "print";