Send existing users an invite to Gluco Check when they use Nightscout Status

[nielsmaerten]

https://github.com/nielsmaerten/gluco-check/issues/106

When someone invokes Nightscout Status

• Check if they are using a language supported by Gluco Check
• If so, check if they've been sent an email before
• If not, send them an email explaining Nightscout Status has been succeeded by Gluco Check

TODO:

• [ ] Define email copy
• [x] Define email template
• [x] Compile template using handlebars (maybe use built-in support from Firebase Extension?)