Show development activity log.

A button in the help dialogue takes the user to the
/feed/… frontend URL, where the latest development
activity is shown, taken from the GitLab RSS feed
for the project.

lib/www/server/api/middleware/rss/get.js

@@ -0,0 +1,21 @@
+const fetch = require('node-fetch');
+
+module.exports = async function (req, res, next) {
+
+	try {
+		if (req.query.remote) {
+			// We're being asked to fetch a remote feed
+			// NOTE: No, we don't limit what feeds the user can fetch
+			
+			const r = await fetch(req.query.remote);
+			if (r && r.ok) {
+				res.set("Content-Type", "application/xml");
+				res.send(await r.text());
+				return;
+			}
+		}
+		res.status(400).send();
+	} catch (err) {
+		next(err);
+	}
+}