added checking for user in welcome controller

app/controllers/welcome.js

@@ -39,6 +39,9 @@ class WelcomeController extends SiteController {
   }
 
   async getWelcomeCoreMember (req, res) {
+    if (req.user) {
+      res.redirect(301, '/');
+    }
     res.render('welcome/core-member');
   }
 
@@ -58,18 +61,27 @@ class WelcomeController extends SiteController {
   }
 
   async getSignupView (req, res) {
+    if (req.user) {
+      res.redirect(301, '/');
+    }
     req.session.captcha = req.session.captcha || { };
     req.session.captcha.signup = captcha.randomText(4 + Math.floor(Math.random()*4));
     res.render('welcome/signup');
   }
 
   async getLoginView (req, res) {
+    if (req.user) {
+      res.redirect(301, '/');
+    }
     res.locals.loginResult = req.session.loginResult;
     res.render('welcome/login');
   }
 
   async getHomeView (req, res, next) {
     try {
+      if (req.user) {
+        res.redirect(301, '/');
+      }
       res.render('welcome/index');
     } catch (error) {
       return next(error);