Create homeDir if it doesn't exist alredy

[neroist]

Title is self-explanitory -- unsure if the directory's creation should be logged or not (probably not?)

[pietroppeter]

yep, self explanatory and straightforward fix to a "bug" we did not know about. Thanks!

Looking at this

nimib/src/nimib/docs.nim

Line 9 in 6daf489

log "creating directory: " & dir

I would say for consistency to log directory creation. (and I think in general looks a good thing to log by default changes to the environment, since we are defaulting for now to a rather verbose nimib).

[pietroppeter]

Thanks, looks good!