feat(api): decouple api from curriculum (#40703)

api-server/server/middlewares/express-extensions.js

@@ -1,23 +0,0 @@
-import qs from 'query-string';
-
-// add rx methods to express
-export default function() {
-  return function expressExtensions(req, res, next) {
-    res.redirectWithFlash = uri => {
-      const flash = req.flash();
-      res.redirect(
-        `${uri}?${qs.stringify(
-          { messages: qs.stringify(flash, { arrayFormat: 'index' }) },
-          { arrayFormat: 'index' }
-        )}`
-      );
-    };
-    res.sendFlash = (type, message) => {
-      if (type && message) {
-        req.flash(type, message);
-      }
-      return res.json(req.flash());
-    };
-    next();
-  };
-}