docs(content): add 435 non‑overlapping intervals doc, condense meta, bump guide badges

apps/docs/content/(01-linear-structures)/hash-table/meta.ts

@@ -1,8 +1,3 @@
 import { defineMeta } from "blume";
 
-export default defineMeta({
-  title: "Hash Table",
-  order: 1,
-  icon: "hash",
-  display: "group",
-});
+export default defineMeta({ title: "Hash Table", order: 1, icon: "hash", display: "group" });