docs: rename category folders to remove parentheses and update heap meta title

apps/docs/content/(heap-priority-queue)/meta.ts

@@ -1,3 +0,0 @@
-import { defineMeta } from "blume";
-
-export default defineMeta({ title: "Heap", order: 14 });

apps/docs/content/heap-priority-queue/meta.ts

@@ -0,0 +1,3 @@
+import { defineMeta } from "blume";
+
+export default defineMeta({ title: "Heap / Priority Queue", order: 14 });