remove noisy funding sources

.github/FUNDING.yml

@@ -1,6 +1 @@
 github: [Jguer]
-custom:
-  [
-    "https://www.blockchain.com/btc/payment_request?address=bc1q703ukdwfpfh24hqzusckt4r6dn88eqve5d0847&message=yay!",
-    "https://coinrequest.io/request/kOSc4hkqYzeJoQv",
-  ]