Move app files to src directory

Signed-off-by: William Brawner <me@wbrawner.com>

Dockerfile

@@ -1,2 +1,3 @@
 FROM nginx:latest
-COPY . /usr/share/nginx/html
+COPY src /usr/share/nginx/html
+

src/index.html

@@ -168,7 +168,7 @@
             </form>
         </div>
         <button class="add-timer" ng-click="openNewTimer()">+</button>
-        <script>
+        <script async>
         if('serviceWorker' in navigator) {
           navigator.serviceWorker
                    .register('/sw.js')

src/manifest.json

@@ -7,6 +7,7 @@
   "author": "William Brawner",
   "chrome": { "navigation": false },
   "default_locale": "en",
+  "start_url": "https://interval-timer.brawner.dev",
   "description": "An interval timer that allows you to customize the intervals",
   "display": "standalone",
   "developer": {