HOME environment variable should be USERPROFILE Windows

[bauersimon]

Thanks for the windows build! I see that the initialization is trying to figure out my home directory on windows using HOME but that variable does not exist on windows.

Results in an ERROR: Could not resolve home directory..

USERPROFILE could be used instead.

[bauersimon]

Realized now that there is already a PR that fixes this: #46.

[bauersimon]

Next problem I'm running into is ERROR: azu does not appear to be a valid theme so there seems to be some problem with the config management.