Reads inst/app/about.md and fills in the time zone of the app,
in which the tabs show the times.
Examples
cat(substr(golemenviro:::about_text(), 1, 300))
#> This app shows the readings of Pimoroni Enviro and Enviro+ sensor boards on a Raspberry Pi, as their Prometheus servers keep them. Each server in the Server box at the top of a tab is one device. Times are in Europe/Athens.
#>
#> **On this page:** [Current](#about-current) · [Time Series](#about-timeseri