Update NGINX configs to have app-specific logfiles and catchall logs

* To make it easier to determine the source of traffic when parsing
  logs, nginx allows for server-specific (app-specific) logs to be set
  * If the logfile does not exist or cannot be created, it uses a
    catchall logfile
* Updated the structure of staticsite to /u/staticsite:
  * `content/` : the content of the site
  * `logs/`: the location of the logfiles