docs: refresh security docs and fork references

Update the STS, security, select, and Docker documentation to reflect the recent hardening work, including LDAP STS throttling details, OIDC JWT verification changes, and the new pgsty-specific security policy and advisory index.

Rewrite repository and raw-document links that still pointed at minio/minio so the docs consistently reference pgsty/minio instead.

The core idea is to keep the documentation aligned with the fork's actual security behavior, ownership, and upgrade guidance without mixing in unrelated code changes.

README.md

@@ -8,7 +8,7 @@
 [![Docker Image](https://img.shields.io/badge/Docker-pgsty/minio-%232496ED?style=flat&logo=docker&logoColor=white)](https://hub.docker.com/r/pgsty/minio)
 
 > [!IMPORTANT]
-> **This is a community-maintained fork of [minio/minio](https://github.com/minio/minio), maintained by [Pigsty](https://pigsty.io).**
+> **This is a community-maintained fork of the upstream MinIO project, maintained by [Pigsty](https://pigsty.io).**
 > This project is **NOT** affiliated with, endorsed by, or sponsored by MinIO, Inc.
 > "MinIO" is a trademark of MinIO, Inc., used here solely to identify the upstream project.
 >
@@ -29,4 +29,3 @@ Console: [`georgmangold/console`](https://github.com/georgmangold/console/), a c
 Ansible Deployment: [https://pigsty.io/docs/minio](https://pigsty.io/docs/minio)
 
 APT/YUM repo for `minio` and `mcli` binary: [https://pigsty.io/docs/infra](https://pigsty.io/docs/repo/infra/list/#object-storage)
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