www/opengist: Update to v1.14.0
- Remove assets dir, they are already bundled in the binary
- Fix the broken rc service that would not shut down correctly
- Move the pidfiles to /var/run/ to avoid needing to create a dir
- Use the prebuilt frontend assets published upstream, dropping the npm build dependency
- Enable aarch64
Reviewed by: fox
Differential Revision: https://reviews.freebsd.org/D58255