Added support for TRANSMISSION_WEB_HOME environment variable

[marcellus00]

Pull request

Purpose Linuxcontainer transmission image contains a few alternative web ui's, however it was impossible to set an environment variable TRANSMISSION_WEB_HOME to use them

Approach Simple fix by adding TRANSMISSION_WEB_HOME to transmission[vpn][.labels].yml files

Open Questions and Pre-Merge TODOs Check all boxes as they are completed

Learning

Requirements

• [x] These changes meet the standards for contributing.
• [x] I have read the code of conduct.