move webpack config out of sapper, into the app

lib/route_manager.js

@@ -0,0 +1,16 @@
+const glob = require('glob');
+const create_routes = require('../utils/create_routes.js');
+const { src } = require('./config.js');
+
+const route_manager = {
+	routes: create_routes(
+		glob.sync('**/*.+(html|js|mjs)', { cwd: src })
+	),
+
+	onchange(fn) {
+		// TODO in dev mode, keep this updated, and allow
+		// webpack compiler etc to hook into it
+	}
+};
+
+module.exports = route_manager;