Mac OS install omero-web

[pwalczysko]

1. The documentation about OMERO web installation on Mac OS is not where it is expected to be.
   This is https://docs.openmicroscopy.org/omero/5.6.0/sysadmins/unix/install-web/web-deployment.html
   Instead, it is inside the Mac OS server installation doc https://docs.openmicroscopy.org/omero/5.6.0/sysadmins/unix/server-install-homebrew.html#omero-web

2. The steps described in https://docs.openmicroscopy.org/omero/5.6.0/sysadmins/unix/server-install-homebrew.html#omero-web are not working. The line 19 in the conf file is erroring - see below
   Btw, https://docs.openmicroscopy.org/omero/5.6.0/developers/Web/Deployment.html#using-wsgi is erroring on the same place, with similar error

(env561-web) pwalczysko@ls31618~$ omero config set omero.web.application_server 'wsgi-tcp'
(env561-web) pwalczysko@ls31618~$ omero web config nginx-development > nginx-development.conf
(env561-web) pwalczysko@ls31618~$ nginx -c $PWD/nginx-development.conf
nginx: [emerg] open() "/Users/pwalczysko/Ilastik-projects/etc/mime.types" failed (2: No such file or directory) in /Users/pwalczysko/nginx-development.conf:19
(env561-web) pwalczysko@ls31618~$ 

cc @manics @will-moore @jburel