Enable caching of static assets (#1217)

* Enable caching of static assets

* Remove dependency on mime package

Since we only care about two file extensions at the moment,
there is no need to grab the whole package just to avoid
calling 'endsWith' twice.

server.js

@@ -1,18 +1,13 @@
 const _ = require('lodash');
 const jwt = require('jwt-simple');
-const expressStaticGzip = require('express-static-gzip');
 const express = require('express');
 const app = express();
 
 const homebrewApi = require('./server/homebrew.api.js');
 const GoogleActions = require('./server/googleActions.js');
+const serveCompressedStaticAssets = require('./server/static-assets.mv.js');
 
-// Serve brotli-compressed static files if available
-app.use('/', expressStaticGzip(`${__dirname}/build`, {
-	enableBrotli    : true,
-	orderPreference : ['br'],
-	index           : false
-}));
+app.use('/', serveCompressedStaticAssets(`${__dirname}/build`));
 
 process.chdir(__dirname);