change format for mod jars

- remove raw jars
- replace with modrinth.index.json
=> + save storage space and network bandwidth
=> - building is now more complicated

client/minecraft/config/threadtweak.json

@@ -1,8 +0,0 @@
-{
-  "threadPriority": {
-    "game": 8,
-    "main": 2,
-    "io": 7,
-    "integratedServer": 7
-  }
-}