update font-awesome to 4.7 and use scss instead of css

package.json

@@ -26,7 +26,7 @@
     "express": "^4.15.4",
     "express-busboy": "^2.4.4",
     "express-validator": "^2.21.0",
-    "font-awesome": "^4.4.0",
+    "font-awesome": "^4.7.0",
     "hivtrace-viz": "^0.0.14",
     "hyphy-vision": "2.1.4",
     "jade": "^1.0.0",

src/entry.js

@@ -9,6 +9,7 @@ window._ = _;
 require("./scss/application.scss");
 require("phylotree.css");
 require("font-awesome/css/font-awesome.css");
+require("font-awesome/css/font-awesome.css");
 require("blueimp-file-upload");
 
 var hyphyVision = require("hyphy-vision");

src/scss/application.scss

@@ -1,6 +1,7 @@
 @import "~bootstrap/scss/bootstrap";
 @import "~hyphy-vision/dist/application.scss";
-@import url("https://use.fontawesome.com/releases/v5.0.9/css/all.css");
+@import "variables";
+@import "~font-awesome/scss/font-awesome";
 @import url("https://fonts.googleapis.com/css?family=Exo+2:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i|Exo:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i|Montserrat:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i|Noto+Sans:400,400i,700,700i|IBM+Plex+Mono:400,500,600,700");
 
 // Hyphy & Datamonkey Colors

src/scss/variables.scss

@@ -0,0 +1 @@
+$fa-font-path: "../../node_modules/font-awesome/fonts";