TFL Status: Update Template to Text. Add API error Handling

Removed content.handlebars and switched to using the text template.
TFL Status: Swap API with ENV VAR

API Key was stored in plain text. Fixed by adding the var {{ENV{DDG_SPICE_TFLSTATUS_APIKEY}}}
Merge pull request #1283 from chrisjwilsoncom/tfl-update

TFL Status: Update Template to Text. Add API error Handling