Use remote_theme & upgraded theme

Author: gpotter2

404.html

@@ -9,5 +9,5 @@ <h1>Whoops, this page doesn't exist.</h1>
   <h1>Move along. (404 error)</h1>
   <br/>
 
-  <img src="{{ site.baseurl }}/img/404.png" />
+  <img src="{{ site.baseurl }}/assets/img/404.png" />
 </div>

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem "github-pages", '163', group: :jekyll_plugins
+gem "github-pages", group: :jekyll_plugins
 
 # enable tzinfo-data for local build
 # gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]