fix: multiple docs issues (#8244)

# Which Problems Are Solved

- `<details>` tag is rendered in some cases in the docs, instead of
rendering a detail section which can be expanded
- New API V2 and V3 services where not rendered correctly
- The plugin which made it possible to integrate external code files and
show them on the docs didn't work anymore

# How the Problems Are Solved

- remove / from details tag, so it is properly rendered
- changing link source from tag to auto
- Someone already forked the repository and made it available for
docusaurus v3, we integrated the forked version

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>

proto/zitadel/settings/v2beta/settings_service.proto

@@ -337,7 +337,6 @@ service SettingsService {
     };
 
     option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
-      tags: "Settings";
       summary: "Get Security Settings";
       description: "Returns the security settings of the ZITADEL instance."
     };
@@ -357,7 +356,6 @@ service SettingsService {
     };
 
     option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
-      tags: "Settings";
       summary: "Set Security Settings";
       description: "Set the security settings of the ZITADEL instance."
     };