Adding Citrix ADC VPX to Nextcloud AIO reverse proxy github list

鈩癸笍 Support 馃摝 Appliances (Docker, Snappy, VM, NCP, AIO)
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Just linking the PR here: Update reverse-proxy.md by esmith443 路 Pull Request #2329 路 nextcloud/all-in-one 路 GitHub
Thanks a lot! :slight_smile: