Update BTCpayserver

service/BTCpayserver.md

-BTCPayServer
-https://btcpay.torproject.net/
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+# BTCPayServer
+The machine is temporarily hosted at Lunanode while a decision is made about where to host it.
+
+Documentation about the current setup can be found at the following links:
+
+- https://docs.btcpayserver.org/Docker/#full-installation-for-technical-users
+
+- https://docs.btcpayserver.org/LunaNodeWebDeployment/
+
+The service is accessible at:
+
+- https://btcpay.torproject.net/
+
+Lunanode was chosen as a cheap and easy temporarily solution. Some doubts remain regarding how to make sure the machine and service are updated on a timely manner. 
+
+In the long term, given the sensitive matter of hosting a payment service, we should have this in our tpa managed infrastructure.
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