Show development activity log.

A button in the help dialogue takes the user to the
/feed/… frontend URL, where the latest development
activity is shown, taken from the GitLab RSS feed
for the project.

lib/www/client/source/src/components/help-dialog.vue

@@ -45,6 +45,14 @@
         <v-icon class="d-lg-none">mdi-bug</v-icon>
         <span class="d-none d-lg-inline">Report a bug</span>
       </v-btn>
+
+      <v-btn
+        color="info"
+        text
+        :href='"/feed/"+feed'
+        title="View development log"
+      >
+        <v-icon>mdi-rss</v-icon>
       </v-btn>
 
       <v-spacer></v-spacer>
@@ -73,7 +81,8 @@ export default {
   data () {
     return {
       dialog: false,
-      email: "dougal-support@aaltronav.eu"
+      email: "dougal-support@aaltronav.eu",
+      feed: btoa(encodeURIComponent("https://gitlab.com/wgp/dougal/software.atom?feed_token=XSPpvsYEny8YmH75Nz5W"))
     };
   }