feat(v2): global data + useGlobalData + docs versions dropdown (#2971)

* doc components initial simplification

* doc components initial simplification

* add docContext test

* Add poc of global data system + use it in the theme

* Revert "doc components initial simplification"

This reverts commit f657b4c4

* revert useless changes

* avoid loosing context on docs switch

* fix docs tests

* fix @generated/globalData ts declaration / es import

* typo

* revert bad commit

* refactor navbar in multiple parts + add navbar item types validation + try to fix remaining merge bugs

* add missing watch mode for plugin debug

* fix docs global data integration, move related hooks to docs plugin + convert to TS

* change versions link label

* fix activeClassName react warning

* improve docs global data system + contextual navbar dropdown

* fix bug preventing the deployment

* refactor the global data system to namespace automatically by plugin name + plugin id

* proper NavbarItem comp

* fix tests

* fix snapshot

* extract theme config schema in separate file + rename navbar links to navbar items

* minor typos

* polish docs components/api

* polish useDocs api surface

* fix the docs version suggestions comp + data

* refactors + add docsClientUtils unit tests

* Add documentation

* typo

* Add check for duplicate plugin ids detection

* multi-instance: createData plugin data should be namespaced by plugin instance id

* remove attempt for multi-instance support

packages/docusaurus-plugin-content-blog/src/index.ts

@@ -50,6 +50,7 @@ export default function pluginContentBlog(
   const dataDir = path.join(
     generatedFilesDir,
     'docusaurus-plugin-content-blog',
+    // options.id ?? 'default',  // TODO support multi-instance
   );
   let blogPosts: BlogPost[] = [];