Relocate reverse-proxy example configurations and update docs/configuring-playbook-own-webserver.md with more details

examples/reverse-proxies/README.md

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+## Using other reverse-proxies for fronting the integrated Traefik reverse-proxy
+
+This directory contains sample configuration for various webservers, showing you how to put these reverse-proxies in front of the integrated Traefik reverse-proxy used by the playbook.
+
+To learn more, see [Fronting the integrated reverse-proxy webserver with another reverse-proxy](../../docs/configuring-playbook-own-webserver.md#fronting-the-integrated-reverse-proxy-webserver-with-another-reverse-proxy).