Reset pot file to ensure clean working dir after commit
Redirect output to /dev/null

There is no reason to clutter the terminal with output for checking
the status of a command. This change redirects that output to
/dev/null to keep things neat.
Move `wp-i18n-tools` to repository root

Files were located in a `vendor` subdirectory. Future plans include
using Composer with this project and any non-Composer files in
`vendor` will cause issues.