Merge JoinMarket-Org/joinmarket-clientserver#1668: update payjoin doc

a5a5132160 update payjoin doc (Marnix)

Pull request description:

  remove old dead links

  If you'd rather replace the links with newer ones, please share them. happy to add/update

ACKs for top commit:
  kristapsk:
    ACK a5a5132160

Tree-SHA512: aab19aa4cd9f0452ea6206a19f843481f1cbad56c4fc746d613707a3991fefe83ff191b4da2d436d1f3024492687ee85504f3842f1ac95e886c98a09aa13af85

docs/PAYJOIN.md

@@ -4,7 +4,7 @@
 reading this).
 
 This document does **not** discuss why PayJoin is interesting or the general concept.
-For that, see [this](https://joinmarket.me/blog/blog/payjoin/) post.
+For that, see [this](https://reyify.com/blog/payjoin) post.
 
 ### Contents
 
@@ -348,10 +348,7 @@ Read about how to do this [here](./tor.md).
 
 ### Using JoinmarketQt to send and receive Payjoins
 
-All of the configuration details above apply to this scenario (for example, setting up Tor if you want to act as receiver.
-But for the workflow on the GUI application, this video explains what to do:
-
-https://video.autizmo.xyz/videos/watch/7081ae10-dce0-491e-9717-389ccc3aad0d
+All of the configuration details above apply to this scenario (for example, setting up Tor if you want to act as receiver).
 
 <a name="sample" />