server: minor, simply get root

server.rb

@@ -74,7 +74,8 @@ after do
 end
 
 get '/' do
-  redirect to('/index.html')
+  content_type 'text/html'
+  send_file File.join(settings.public_folder, 'index.html')
 end
 
 def get_part_by_id(id)