Small improvements:

- Switch to CodeMirror
- Switch to Parcel Bundler
- Fix synchronisation bug
- Update dependencies

src/manifest.webmanifest

@@ -0,0 +1,56 @@
+{
+   "short_name": "Secure Notes",
+   "name": "Secure Notes",
+   "decription": "A place to store your notes securly",
+   "share_target": {
+      "action": "/share",
+      "method": "GET",
+      "enctype": "application/x-www-form-urlencoded",
+      "params": {
+         "title": "title",
+         "text": "text",
+         "url": "url"
+      }
+   },
+   "icons": [
+      {
+         "src": "public/notepad16.png",
+         "sizes": "16x16",
+         "type": "image/png"
+      },
+      {
+         "src": "public/notepad24.png",
+         "sizes": "24x24",
+         "type": "image/png"
+      },
+      {
+         "src": "public/notepad32.png",
+         "sizes": "32x32",
+         "type": "image/png"
+      },
+      {
+         "src": "public/notepad64.png",
+         "sizes": "64x64",
+         "type": "image/png"
+      },
+      {
+         "src": "public/notepad128.png",
+         "sizes": "128x128",
+         "type": "image/png"
+      },
+      {
+         "src": "public/notepad256.png",
+         "sizes": "256x256",
+         "type": "image/png"
+      },
+      {
+         "src": "public/notepad512.png",
+         "sizes": "512x512",
+         "type": "image/png"
+      }
+   ],
+   "start_url": "/",
+   "display": "standalone",
+   "theme_color": "#1E88E5",
+   "background_color": "#ffffff"
+}