Add a vhost role

docs/vhost.md

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+# Required variables
+These variables are required for this role to function. Example values provided
+
+```
+vhost_id: myservice # A unique identifier for this vhost. Not visible to end users.
+vhost_type: reverse_proxy # Supported values: reverse_proxy, redirect
+vhost_domains:
+  - www.domain.tld
+  - domain.tld
+```
+
+# Optional variables
+These variables have the following default values.
+
+```
+web_server: caddy # Supported values: caddy, none
+```
+
+# Variables specific to vhost type
+## reverse\_proxy
+
+Required:
+```
+proxy_target_port: 8080
+```
+
+Optional:
+```
+proxy_target_host: localhost
+proxy_target_protocol: http
+```
+
+## redirect
+
+Required:
+```
+redirect_target: https://www.domain.tld/location
+```
+
+Optional:
+```
+redirect_type: temporary # Supported values: temporary, permanent
+```
+