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/views/dns.pug

@@ -0,0 +1,57 @@
+//-
+  ztncui - ZeroTier network controller UI
+  Copyright (C) 2017-2021  Key Networks (https://key-networks.com)
+  Licensed under GPLv3 - see LICENSE for details.
+
+extends network_layout
+
+block net_content
+  - const dns = network.dns || {};
+  if (!dns.domain && !(dns.servers && dns.servers.length > 0))
+    .row
+      .col-sm-12
+        b No DNS configuration on this network.
+  else
+    .row
+      .col-sm-2
+        b Domain:
+      .col-sm-10
+        p= dns.domain
+    .row
+      .col-sm-2
+        b Servers:
+      .col-sm-10
+        .row
+          each server in dns.servers
+            .col-sm-12= server
+
+  .row
+    .col-sm-12
+      h3 Change DNS configuration:
+
+  form(method='POST' action='')
+    .form-group.row
+      .col-sm-12
+        label(for='domain') Domain:
+      .col-sm-12
+        input#domain.form-control(type='text' name='domain' value=dns.domain)
+
+    .form-group.row
+      .col-sm-12
+        label(for='servers') Servers:
+      .col-sm-12
+        textarea#servers.form-control(type='text' name='servers' placeholder='(one IP address per line)')
+          = !dns.servers ? '' : dns.servers.join('\n')
+
+    .form-group.row
+      .col-sm-12
+        button.btn.btn-primary(type='submit') Submit
+        = ' '
+        a.btn.btn-default(href=('/controller/network/' + network.nwid) name='cancel' role='button') Cancel
+
+  if errors
+    .row
+      .col-sm-12
+        ul
+          for err in errors
+            li!= err.msg