Review apps with Dokku

The dokku server has these plugins:

• https://github.com/dokku/dokku-postgres
• https://github.com/josegonzalez/dokku-global-cert (makes the wildcard cert work automatically on *.dokku.soapbox.pub)
• https://github.com/crisward/dokku-require (makes app.json work with postgres)

For the wildcard cert, I had to create an origin certificate in Cloudflare then add it to the plugin. I also had to create an edge cert to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH. Then it just worked.