chore: remove ROLLDOWN_OPTIONS_VALIDATION=loose from vitepress config

Author: sapphi-red

docs/.vitepress/config.ts

@@ -9,9 +9,6 @@ import llmstxt from 'vitepress-plugin-llms'
 import type { PluginOption } from 'vite'
 import { buildEnd } from './buildEnd.config'
 
-// NOTE: allow additional options to be passed to rolldown for now
-process.env.ROLLDOWN_OPTIONS_VALIDATION = 'loose'
-
 const ogDescription = 'Next Generation Frontend Tooling'
 const ogImage = 'https://vite.dev/og-image.jpg'
 const ogTitle = 'Vite'