* add optional java script to fetch data regullary
* change file extension to `html.j2` for templates
* fix route for fetch data
- for running in iframes (e.g. HA ingress) we must
use relative path in the URLs
* increase test coverage
* remove unused statements
* configure path to web files for Quart
* copy web-file into the add-on container
* add test template and stylesheet
* add w3.css dashboard
* fix unit test for test dashboard
* add Roboto font
* add awesome web font
* add all favicon formats
* load fonts locally
* adapt unit tests
* add all font and favicons to add-on
* fix sonarqube warnings
* add unit tests for all favicons