docs: remove user schema and user api documentation from v3 api version (#9358)

# Which Problems Are Solved

Due to other priorities we decided to push the implementation of user
schema back in the roadmap.
As the feature is not yet complete and can't be tested/used, the API
Docs V3 for user schema and user lead to confusion.

# How the Problems Are Solved

I removed the api docs for user schema and user v3 from the sidenav for
the moment

Co-authored-by: Livio Spring <livio.a@gmail.com>

docs/docusaurus.config.js

@@ -324,22 +324,6 @@ module.exports = {
               categoryLinkSource: "auto",
             },
           },
-          user_schema_v3: {
-            specPath: ".artifacts/openapi/zitadel/resources/userschema/v3alpha/user_schema_service.swagger.json",
-            outputDir: "docs/apis/resources/user_schema_service_v3",
-            sidebarOptions: {
-              groupPathsBy: "tag",
-              categoryLinkSource: "auto",
-            },
-          },
-          user_v3: {
-            specPath: ".artifacts/openapi/zitadel/resources/user/v3alpha/user_service.swagger.json",
-            outputDir: "docs/apis/resources/user_service_v3",
-            sidebarOptions: {
-              groupPathsBy: "tag",
-              categoryLinkSource: "auto",
-            },
-          },
           action_v3: {
             specPath: ".artifacts/openapi/zitadel/resources/action/v3alpha/action_service.swagger.json",
             outputDir: "docs/apis/resources/action_service_v3",