update nightscout web monitor

Howdy! :smile_cat: 


This is a "pull request" to update your version of cgm-remote-monitor (the code that runs on Azure to power your website) to include our latest recommendations.

Follow the link to this pull request, and use the green Merge button to confirm that you'd like to use our updates.  A few moments later, Azure will create a new deployment and within 10 minutes or so you should see updates on your website.  Also arrows and bg delta on the pebble will likely show up.