Fix icons not displayed in ActiveAdmin (#959)

Author: claramaffei

app/assets/stylesheets/active_admin.scss

@@ -6,10 +6,12 @@
 //
 // For example, to change the sidebar width:
 // $sidebar-width: 242px;
+$fa-font-path: ".";
 
 // Active Admin's got SASS!
 @import 'arctic_admin/src/scss/main';
-@import '@fortawesome/fontawesome-free/css/all.css';
+@import '@fortawesome/fontawesome-free/scss/fontawesome.scss';
+@import '@fortawesome/fontawesome-free/scss/solid.scss';
 
 // Overriding any non-variable Sass must be done after the fact.
 // For example, to change the default status-tag color:

config/initializers/assets.rb

@@ -9,8 +9,9 @@
 # Rails.application.config.assets.paths << Emoji.images_path
 # Add Yarn node_modules folder to the asset load path.
 Rails.application.config.assets.paths << Rails.root.join('node_modules')
+Rails.application.config.assets.paths << Rails.root.join('node_modules/@fortawesome/fontawesome-free/webfonts')
 
 # Precompile additional assets.
 # application.js, application.css, and all non-JS/CSS in the app/assets
 # folder are already added.
-Rails.application.config.assets.precompile += %w[active_admin.js active_admin.css]
+Rails.application.config.assets.precompile += %w[active_admin.js active_admin.css *.ttf *.woff2]