Introduces New Installation Page

If there are no users signed up and no conferences we show a page
informing people what they need to do.

app/models/user.rb

@@ -265,12 +265,14 @@ class User < ApplicationRecord
     proposals(conference).count
   end
 
+  def self.empty?
+    User.count == 1 && User.first.email == 'deleted@localhost.osem'
+  end
+
   private
 
   def setup_role
-    if User.count == 1 && User.first.email == 'deleted@localhost.osem'
-      self.is_admin = true
-    end
+    self.is_admin = true if User.empty?
   end
 
   def touch_events

app/views/conferences/_new_install.html.haml

@@ -0,0 +1,21 @@
+.row
+  .col-md-12
+    .well
+      %h1
+        Welcome to your new
+        = link_to('https://osem.io') do
+          Open Source Event Manager
+        installation!
+      %p
+        The first user to
+        - if ENV['OSEM_ICHAIN_ENABLED'] == 'true'
+          = link_to(new_ichain_registration_path('user')) do
+            sign up
+        - else
+          = link_to(new_registration_path('user')) do
+            sign up
+        will the be administrator of it.
+      %p
+        We hope you enjoy using OSEM, if you have any question don't hesitate to
+        = link_to('http://osem.io/#contact') do
+          contact us!

app/views/conferences/index.html.haml

@@ -5,7 +5,7 @@
         %h2 Upcoming Conferences
   - @current.each do |conference|
     = render '/conferences/conference_details', conference: conference
-  -if @antiquated and @antiquated.any?
+  - if @antiquated and @antiquated.any?
     .row
       .col-md-12
         %p.text-right
@@ -18,6 +18,8 @@
     #antiquated.collapse
       - @antiquated.each do |conference|
         = render '/conferences/conference_details', conference: conference
+  - if @antiquated.empty? && @current.empty? && User.empty?
+    = render partial: 'new_install'
 
 -content_for :script_body do
   :javascript