stickers: add more signal stickers

uploaded-packs/index.json

@@ -1,7 +1,18 @@
 {
   "packs": [
     "chatsticker-donald-and-friends.json",
-    "lindner.json"
+    "Lindner.json",
+    "Beachboy_Soder.json",
+    "cat_gang.json",
+    "cats.json",
+    "HTTP_Cats.json",
+    "Meme_Pack.json",
+    "Meow.json",
+    "Moody_Animals.json",
+    "Olaf_Scholz.json",
+    "Squirtle_for_the_Squad.json",
+    "Trains.json",
+    "WTF_Paintings.json"
   ],
   "homeserver_url": "https://matrix.pub.solar"
 }