lib: Update uWSGI, nginx config files

lib: Update uWSGI, nginx config files

The nginx file was a replacement for '/etc/nginx/nginx.conf' instead of
a "site" file, while the uWSGI file referenced the Python 2 plugin
despite the sample deployment guide, which uses this, being Python
3-based. Correct both issues.

Signed-off-by: Stephen Finucane <stephen@that.guru>