Rework login page to be AJAX/Vue.js based

app/unit/LDAPServerUnit.js

@@ -1,5 +1,6 @@
 const Unit = require('libflitter/Unit')
 const LDAP = require('ldapjs')
+const Validator = require('email-validator')
 
 class LDAPServerUnit extends Unit {
     static get name() {
@@ -45,8 +46,7 @@ class LDAPServerUnit extends Unit {
      * @returns {boolean}
      */
     validate_email(email) {
-        const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
-        return re.test(String(email).toLowerCase())
+        return Validator.validate(email)
     }
 
     /**