Migrate to slash commands (#431)

Co-authored-by: Federico fuji97 Rapetti <fuji1097@gmail.com>

migrations/20220128000207_add_favorite_query_model/migration.sql

@@ -0,0 +1,10 @@
+-- CreateTable
+CREATE TABLE "FavoriteQuery" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "guildId" TEXT NOT NULL,
+    "authorId" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "query" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);