Enhance middleware and route handling for LLMs

### Summary of Changes
- Updated middleware to include additional redirects for `/skill.md` and `/skills.md` to `/llms.txt`.
- Refactored redirect logic in LLM routes to use `NextResponse.redirect` for improved clarity and consistency.
- Adjusted URL handling in `llms.txt` to ensure proper relative URL extraction for documentation and API pages.

These changes improve the routing logic and ensure better handling of various URL formats.

docs/src/app/llms.mdx/[[...slug]]/route.ts

@@ -1,4 +1,3 @@
-import { redirect } from 'next/navigation';
 import { NextResponse, type NextRequest } from 'next/server';
 import { getLLMText } from '../../../../lib/get-llm-text';
 import { apiSource, source } from '../../../../lib/source';
@@ -6,7 +5,7 @@ import { apiSource, source } from '../../../../lib/source';
 export const revalidate = false;
 
 export async function GET(
-  _req: NextRequest,
+  request: NextRequest,
   { params }: { params: Promise<{ slug?: string[] }> },
 ) {
   const { slug } = await params;
@@ -19,7 +18,9 @@ export async function GET(
     page = apiSource.getPage(slug);
   }
 
-  if (!page) redirect("/");
+  if (!page) {
+    return NextResponse.redirect(new URL('/', request.url), 307);
+  }
 
   try {
     return new NextResponse(await getLLMText(page));

docs/src/app/llms.txt/route.ts

@@ -9,11 +9,17 @@ export async function GET() {
   const apiUrls = new Set<string>();
 
   for (const page of source.getPages()) {
-    docsUrls.add(`/llms${page.url}`.slice('/llms/docs/'.length));
+    const relativeUrl = page.url.replace(/^\/docs\/?/, '');
+    if (relativeUrl !== '') {
+      docsUrls.add(relativeUrl);
+    }
   }
 
   for (const page of apiSource.getPages()) {
-    apiUrls.add(`/llms${page.url}`.slice('/llms/api/'.length));
+    const relativeUrl = page.url.replace(/^\/api\/?/, '');
+    if (relativeUrl !== '') {
+      apiUrls.add(relativeUrl);
+    }
   }
 
   const body = [

docs/src/app/llms/[[...slug]]/route.ts

@@ -1,4 +1,3 @@
-import { redirect } from 'next/navigation';
 import { NextResponse, type NextRequest } from 'next/server';
 import { getLLMText } from '../../../../lib/get-llm-text';
 import { apiSource, source } from '../../../../lib/source';
@@ -36,7 +35,7 @@ export async function GET(
   const page = resolvePage(slug);
 
   if (!page) {
-    redirect("/");
+    return NextResponse.redirect(new URL('/', request.url), 307);
   }
 
   try {

docs/src/middleware.ts

@@ -18,7 +18,9 @@ export default function middleware(request: NextRequest, event: NextFetchEvent)
 
   if (
     pathname === '/SKILL.md' ||
-    pathname === '/SKILLS.md'
+    pathname === '/SKILLS.md' ||
+    pathname === '/skill.md' ||
+    pathname === '/skills.md'
   ) {
     const url = request.nextUrl.clone();
     url.pathname = '/llms.txt';
@@ -81,6 +83,8 @@ export const config = {
   matcher: [
     '/SKILL.md',
     '/SKILLS.md',
+    '/skill.md',
+    '/skills.md',
     '/docs/:path*',
     '/api/:path*',
   ],