refactor: remove training property description, add svgIconURL, drop old migration and create new

- since app was not deployed yet, i deleted the migration to keep them clean

prisma/migrations/20230626200425_training/migration.sql

@@ -0,0 +1,23 @@
+-- CreateTable
+CREATE TABLE "Training" (
+    "id" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "slug" TEXT NOT NULL,
+    "days" INTEGER NOT NULL,
+    "weight" INTEGER NOT NULL,
+    "draft" BOOLEAN NOT NULL DEFAULT true,
+    "logoURL" TEXT,
+    "svgIconURL" TEXT,
+    "repositoryURL" TEXT,
+    "priceOpen" INTEGER NOT NULL,
+    "priceCorporate" INTEGER NOT NULL,
+    "content" TEXT,
+
+    CONSTRAINT "Training_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Training_slug_key" ON "Training"("slug");
+
+-- CreateIndex
+CREATE INDEX "Training_slug_idx" ON "Training"("slug");