Update DO link

Author: santiagolizardo

docs/admin-manual/debian-nginx-letsencrypt.md

@@ -22,7 +22,7 @@ Find a server where to install Reconmap. The hardware requirements vary dependin
 
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+[![DigitalOcean Referral Badge](https://web-platforms.sfo2.cdn.digitaloceanspaces.com/WWW/Badge%201.svg)](https://www.digitalocean.com/?refcode=44bd6d34b6ac&utm_campaign=Referral_Invite&utm_medium=Referral_Program&utm_source=badge)
 
 ### Install basic tools