Update w3pn matrix link

Author: burningtree

src/index.yaml

@@ -22,7 +22,7 @@ links:
   organisational membership: https://docs.web3privacy.info/get-involved/org-benefits
   donate: https://docs.web3privacy.info/get-involved/donate
   twitter: https://twitter.com/web3privacy
-  matrix: https://matrix.web3privacy.info
+  matrix: https://matrix.to/#/%23web3privacy:matrix.org
   bluesky: https://bsky.app/profile/web3privacy.info
   mirror: https://mirror.xyz/0x0f1F3DAf416B74DB3DE55Eb4D7513a80F4841073
   youtube: https://youtube.com/@Web3PrivacyNow