feat(config): add Blume configuration file

blume.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from "blume";
+
+export default defineConfig({
+  title: "Leetcode",
+  description: "Documentation powered by Blume.",
+  deployment: {
+    site: "https://prdlk.github.io",
+    base: "/leetcode",
+  },
+});