Update links in README

Author: angristan

README.md

@@ -91,9 +91,9 @@ To be noted:
 
 ### Recommended providers
 
-- [Vultr](https://www.vultr.com/?ref=8948982-8H): Worldwide locations, IPv6 support, starting at \$2.5/month
-- [Hetzner](https://hetzner.cloud/?ref=ywtlvZsjgeDq): Worldwide locations, IPv6, 20 TB of traffic, starting at €3.59/month
-- [Digital Ocean](https://m.do.co/c/ed0ba143fe53): Worldwide locations, IPv6 support, starting at \$4/month
+- [Vultr](https://umami.stanislas.cloud/q/1HH9Thp8i): Worldwide locations, IPv6 support, starting at \$2.5/month
+- [Hetzner](https://umami.stanislas.cloud/q/HdzaOJWq7): Worldwide locations, IPv6, 20 TB of traffic, starting at €3.59/month
+- [Digital Ocean](https://umami.stanislas.cloud/q/sEVh1l79B): Worldwide locations, IPv6 support, starting at \$4/month
 
 ## Usage