improve deploy script

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 .DS_Store
+_site

config/deploy.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+if [ `git branch --list gh-pages` ]
+then
+  git branch -D gh-pages
+  git checkout -b gh-pages
+else
+  git checkout -b gh-pages
+fi
+rm -f .gitignore
+npm run build
+git add _site
+git commit -m 'Update Website'
+git push upstream `git subtree split --prefix _site gh-pages`:gh-pages -f
+git checkout -f
+git checkout master

package.json

@@ -4,7 +4,7 @@
   "description": "A list of helpful front-end related questions you can use to interview potential candidates, test yourself or completely ignore.",
   "scripts": {
     "build": "eleventy --config=config/eleventy.config.js --pathprefix='Front-end-Developer-Interview-Questions/'",
-    "deploy": "git subtree push --prefix _site git@github.com:h5bp/Front-end-Developer-Interview-Questions.git gh-pages",
+    "deploy": "sh ./config/deploy.sh",
     "contributors:add": "all-contributors add",
     "contributors:generate": "all-contributors generate",
     "start": "eleventy --config=config/eleventy.config.js --serve --port 9090 --quiet"