[I18N] *: remove .tx/config

After the switch to Weblate, we now only use the `.weblate.json` file
instead of the previous `.tx/config` file.

closes #1139

X-original-commit: 74a1eb1
Related: odoo/odoo#225467
Related: odoo/enterprise#93872
Related: odoo/documentation#14491
Signed-off-by: Louis Wicket (wil) <[email protected]>
Signed-off-by: Dylan Kiss (dyki) <[email protected]>

Author: dylankiss