feat: add rootNotionSpaceId optional config

lib/config.ts

@@ -5,10 +5,20 @@
  * for optional depenencies.
  */
 
+import { parsePageId } from 'notion-utils'
 import { getSiteConfig, getEnv } from './get-config-value'
 
 // where it all starts -- the site's root Notion page
-export const rootNotionPageId: string = getSiteConfig('rootNotionPageId')
+export const rootNotionPageId: string = parsePageId(
+  getSiteConfig('rootNotionPageId'),
+  { uuid: false }
+)
+
+// if you want to restrict pages to a single notion workspace (optional)
+export const rootNotionSpaceId: string | null = parsePageId(
+  getSiteConfig('rootNotionSpaceId', null),
+  { uuid: true }
+)
 
 // general site config
 export const name: string = getSiteConfig('name')