notifications: fix update notification

the notification wasn't working because this was in apptask and the apptask died
before it could send out the email. we now move the notification to box process
and also remove the email notification.

src/mail_templates/app_updated.ejs

@@ -1,40 +0,0 @@
-<%if (format === 'text') { %>
-
-Dear Cloudron Admin,
-
-The application '<%= title %>' installed at <%= appFqdn %> was updated to app package version <%= version %>.
-
-Changes:
-<%= changelog %>
-
-Powered by https://cloudron.io
-
-Sent at: <%= new Date().toUTCString() %>
-
-<% } else { %>
-
-    <center>
-
-        <img src="<%= cloudronAvatarUrl %>" width="128px" height="128px"/>
-
-        <h3>Dear <%= cloudronName %> Admin,</h3>
-
-        <br/>
-
-        <div style="width: 650px; text-align: left;">
-            The application '<%= title %>' installed at <%= appFqdn %> was updated to app package version <%= version %>.
-
-            <h5>Changelog:</h5>
-            <%- changelogHTML %>
-        </div>
-
-        <br/>
-        <br/>
-
-        <div style="font-size: 10px; color: #333333; background: #ffffff;">
-            Powered by <a href="https://cloudron.io">Cloudron</a>.<br/>
-            Sent at: <%= new Date().toUTCString() %>
-        </div>
-
-    </center>
-<% } %>

src/mail_templates/test_data.json

@@ -1,48 +0,0 @@
-{
-  "app_updated.ejs": {
-    "format": "html",
-    "title": "WordPress",
-    "appFqdn": "updated.smartserver.io",
-    "version": "1.3.4",
-    "changelog": "* This has changed\n * and that as well",
-    "changelogHTML": "<ul><li>This has changed</li><li>and that as well</li></ul>",
-    "cloudronName": "Smartserver",
-    "cloudronAvatarUrl": "https://cloudron.io/img/logo.png"
-  },
-  "app_updates_available.ejs": {
-    "format": "html",
-    "webadminUrl": "https://my.cloudron.io",
-    "cloudronName": "Smartserver",
-    "cloudronAvatarUrl": "https://cloudron.io/img/logo.png",
-    "hasSubscription": true,
-    "apps": [{
-      "updateInfo": {
-        "manifest": {
-          "version": "1.4.3"
-        }
-      },
-      "app": {
-        "fqdn": "site.smartserver.io",
-        "manifest": {
-          "title": "WordPress"
-        }
-      },
-      "changelog": "* This has changed\n * and that as well",
-      "changelogHTML": "<ul><li>This has changed</li><li>and that as well</li></ul>"
-    }, {
-      "updateInfo": {
-        "manifest": {
-          "version": "0.1.3"
-        }
-      },
-      "app": {
-        "fqdn": "another.smartserver.io",
-        "manifest": {
-          "title": "RocketChat"
-        }
-      },
-      "changelog": "* This has changed\n * and that as well",
-      "changelogHTML": "<ul><li>This has changed</li><li>and that as well</li></ul>"
-    }]
-  }
-}