chore(deps): upgrade to nextjs 16 (#2203)

* chore(deps): upgrade to nextjs 16

* upgraded fumadocs

* ensure vercel uses bun

* fix build

* fix bui;d

* remove redundant vercel.json

apps/docs/lib/llms.ts

@@ -2,9 +2,8 @@ import type { InferPageType } from 'fumadocs-core/source'
 import type { source } from '@/lib/source'
 
 export async function getLLMText(page: InferPageType<typeof source>) {
+  const processed = await page.data.getText('processed')
   return `# ${page.data.title} (${page.url})
 
-${page.data.description || ''}
-
-${page.data.content || ''}`
+${processed}`
 }