[Feature request] Support location-based time zones to be able to account for DST

[el-tiuri]

The current UTC offset based approach means that people living in places with DST always have half of their scrobbles off by an hour, and that they'd also manually have to change the UTC offset when DST starts/ends. Using tz database time zones would fix this issue entirely.

Related to #247

[FoxxMD]

You can workaround this if you are using the docker container by using the env TZ ex

docker run -d -e "TZ=America/New_York" ... krateng/maloja`

The base image uses TZ with tz database timezones to set the timezone for the whole system, which maloja will then use if a timezone is not explicitly set.