Shift functionality to new file in attempt to reduce code duplication in server.js

client/homebrew/pages/sharePage/source_dl.jsx

@@ -0,0 +1,14 @@
+const sourceDL = function(res, brew) {
+	const fileName = brew.title.replaceAll(' ', '-').replaceAll(':', '').replaceAll('/', '');
+
+	res.status(200);
+	res.set({
+		'Cache-Control'       : 'no-cache',
+		'Content-Type'        : 'text/plain',
+		'Content-Disposition' : `attachment; filename="HomeBrewery-${fileName}.txt"`
+	});
+
+	return res;
+};
+
+module.exports = sourceDL;