Some changes, including DNS support (#57)

* remove CDN

* Add a link to "members" in the network detail page

* Show object values as JSON

* remove TLS options

* Minor style improvements

* Show object values as JSON (member_detail)

* Add missing 'const'

* Navbar height fix

* Merge jQuery ready functions

* Change brand

* Merge network pages (name, members, detail) into single page and...

* Show ZT version on controller index page
* Show count of members
* Use <code> tag to display JSON data
* Fix error in some "error" pages caused by missing "navigate" when
  rendering nav items, use pug mixin to render nav items.
* Adjust column widths of network list

* Refactor: move duplicated nav code to `head_layout`

* Remove some debug logging code

* Get network members detail parallelly

* Add missing frontend script for members

* Revert "Change brand"

* Remove "members" and "name" pages which are merged into "detail"

* Add DNS support

* Trivial changes (table width etc.)

* Don't try to read TLS cert files when not using HTTPS

* Validate DNS IP

* Downgrade jquery to 3.4.1 to fix nav bar collapse

* Revert "Navbar height fix"

This reverts commit 8edaa9aa81, which
break the nav item height on mobile.

* Add missing margin for some buttons

* Display current DNS configuration above inputs

* Change network rename UI/UX

* Includes 'jquery.min.js' in pkg

* Improve JSON value rendering

* Get peer status of network members

* Display members with peer status

* Show controller itself as "CONTROLLER"

* Display peer address

* Improve login redirection

* pr57: Doc updates; version bump

* pr57: Year update

Co-authored-by: Key Networks <34238649+key-networks@users.noreply.github.com>

src/routes/index.js

@@ -1,6 +1,6 @@
 /*
   ztncui - ZeroTier network controller UI
-  Copyright (C) 2017-2018  Key Networks (https://key-networks.com)
+  Copyright (C) 2017-2021  Key Networks (https://key-networks.com)
   Licensed under GPLv3 - see LICENSE for details.
 */
 
@@ -10,8 +10,17 @@ const authenticate = auth.authenticate;
 const restrict = auth.restrict;
 const router = express.Router();
 
+/** Redirect logged user to controler page */
+function guest_only(req, res, next) {
+  if (req.session.user) {
+    res.redirect('/controller');
+  } else {
+    next();
+  }
+}
+
 /* GET home page. */
-router.get('/', function(req, res, next) {
+router.get('/', guest_only, function(req, res, next) {
   res.render('front_door', {title: 'ztncui'});
 });
 
@@ -21,7 +30,7 @@ router.get('/logout', function(req, res) {
   });
 });
 
-router.get('/login', function(req, res) {
+router.get('/login', guest_only, function(req, res) {
   let message = null;
   if (req.session.error) {
     if (req.session.error !== 'Access denied!') {
@@ -40,7 +49,7 @@ router.post('/login', async function(req, res) {
         req.session.user = user;
         req.session.success = 'Authenticated as ' + user.name;
         if (user.pass_set) {
-          res.redirect('/controller');
+          res.redirect(req.query.redirect || '/controller');
         } else {
           res.redirect('/users/' + user.name + '/password');
         }