unifi docs

docs/unifi.md

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+Unifi is installed with host network mode.
+
+# Required variables
+These variables are required. Example values included. Some general variables might also be required for this role.
+
+```
+ports:
+  unifi:
+    https: 8443
+
+docker_vhost_domains: 
+  unifi:
+    - unifi.domain.tld
+```