template directory fails on non-default path

[pax]

It looks that for any path for templates dir other than the default --template-dir templates/ is ignored

I suspect the problem is that the template files are always copied in the /templates folder, regardless of the --template-dir option, while/but index.py takes note on the custom path, thus the mismatch.

Currently, the only way to make templates work is to run datasette publish from the parent folder of templates dir, named as such.

Vercel CLI 23.0.0

[rclement]

Duplicate issue: #41
Associated PR: #42