docs(docs): add frequency map page, restructure docs and update links

docs/(algorithms)/01-frequency-map.mdx

@@ -0,0 +1,15 @@
+---
+title: 'Frequency Map'
+description: 'Converging/parallel index walk that prunes the O(n^2) pair space using order.'
+---
+
+:::warning[Under construction]
+This page is a scaffold. Notes, canonical problems, and template code are not written yet.
+:::
+
+## Concepts
+
+
+
+
+

docs/(algorithms)/meta.ts

@@ -0,0 +1,6 @@
+import { defineMeta } from "blume";
+
+export default defineMeta({
+  title: "Algorithms",
+  order: 2,
+});

docs/(data-structures)/01-arrays-and-strings.mdx

@@ -37,7 +37,7 @@ Random access in this context means that you can access an element at any index
 <Tile
   title="Two Pointers"
   description="Ship your first page in minutes."
-  href="/arrays-and-strings/two-pointers"
+  href="/leetcode/two-pointers"
 >
   <Icon icon="rocket" size={28} />
 </Tile>
@@ -46,7 +46,7 @@ Random access in this context means that you can access an element at any index
 <Tile
   title="Sliding Window"
   description="Ship your first page in minutes."
-  href="/docs/quickstart"
+  href="/leetcode/sliding-window"
 >
   <Icon icon="rocket" size={28} />
 </Tile>
@@ -55,7 +55,7 @@ Random access in this context means that you can access an element at any index
 <Tile
   title="Prefix Sum"
   description="Ship your first page in minutes."
-  href="/docs/quickstart"
+  href="/leetcode/prefix-sum"
 >
   <Icon icon="rocket" size={28} />
 </Tile>

docs/(data-structures)/meta.ts

@@ -0,0 +1,6 @@
+import { defineMeta } from "blume";
+
+export default defineMeta({
+  title: "Data Structures",
+  order: 1,
+});

docs/index.mdx

@@ -5,6 +5,8 @@ description: Welcome to your new Blume docs.
 
 ## Getting Started
 
+![Dependency Map](./dependency-spine.svg)
+
 Welcome to **Blume** — markdown-first docs powered by Astro and Vite.
 
 Edit `docs/index.mdx` to get started, then run `blume dev`.