Tooling update (#184)

* Use a common Makefile/build process

* Use ESLint with the pa11y lint config

config.js

@@ -12,7 +12,6 @@
 //
 // You should have received a copy of the GNU General Public License
 // along with Pa11y Dashboard.  If not, see <http://www.gnu.org/licenses/>.
-
 'use strict';
 
 const fs = require('fs');