Add Gulpfile.js and remove unneeded images

Gulpfile.js

@@ -0,0 +1,20 @@
+"use strict"
+let gulp = require('gulp');
+let cleanCSS = require('gulp-clean-css');
+let uglify = require('gulp-uglify');
+let concat = require('gulp-concat');
+
+gulp.task('styles', () => {
+  return gulp.src('css/*.css')
+    .pipe(cleanCSS({compatibility: 'ie8'}))
+  	.pipe(concat('all.css'))
+    .pipe(gulp.dest('dist'));
+});
+
+gulp.task('scripts', () => {
+  return gulp.src('js/*.js')
+  	.pipe(uglify())
+  	.pipe(concat('all.js'))
+  	.pipe(gulp.dest('dist'))
+})
+