Update LN Markets app description (#945)

Co-authored-by: nmfretz <nmfretz@gmail.com>

lnmarkets/umbrel-app.yml

@@ -3,13 +3,9 @@ id: lnmarkets
 category: bitcoin
 name: LN Markets
 version: "2.0.0"
-tagline: Trade Bitcoin derivatives on Lightning
+tagline: The first instant settlement Bitcoin trading platform
 description: >-
-  LN Markets is the first Lightning-native Bitcoin derivatives
-  trading platform.
-
-
-  LN Markets enables traders to take minimal counterparty risk: you can trade directly from your Lightning wallet for instant and almost costless transactions. Since March 2020, we have processed over $500 million of trading volume, with a median fee of 1 sat for instant P&L delivery to your wallet.
+  LN Markets is the first instant settlement Bitcoin trading platform. More info: linktr.ee/lnmarkets
 
 
   This Umbrel App gives you another way to interact with LN Markets: you can directly deposit, withdraw, get trading stats and get instantly connected to your account to take positions as usual. More features may come in the future!
@@ -31,4 +27,4 @@ path: ""
 submitter: LN Markets
 submission: https://github.com/getumbrel/umbrel/pull/879
 releaseNotes: >-
-  - Allow to login with both deprecated and correct LNURL method
+  - Allow to login with both deprecated and correct LNURL method