Bring back font-awesome-rails

we need it untill we remove all the old admin pages

Gemfile

@@ -28,6 +28,7 @@ gem 'dotenv-rails', require: 'dotenv/rails-now' # dotenv should always be loaded
 gem 'flipper'
 gem 'flipper-active_record'
 gem 'flipper-ui'
+gem 'font-awesome-rails'
 gem 'fugit'
 gem 'geocoder'
 gem 'gon'

Gemfile.lock

@@ -236,6 +236,8 @@ GEM
       fog-core (~> 2.1)
       fog-json (>= 1.0)
       ipaddress (>= 0.8)
+    font-awesome-rails (4.7.0.5)
+      railties (>= 3.2, < 6.1)
     formatador (0.2.5)
     fugit (1.3.3)
       et-orbi (~> 1.1, >= 1.1.8)
@@ -751,6 +753,7 @@ DEPENDENCIES
   flipper
   flipper-active_record
   flipper-ui
+  font-awesome-rails
   fugit
   geocoder
   gon

app/assets/stylesheets/application.scss

@@ -33,6 +33,7 @@
 // = require attestation_template_edit
 
 // = require_self
+// = require font-awesome
 // = require leaflet
 // = require franceconnect
 // = require bootstrap-wysihtml5