Vault product documentation website

[!IMPORTANT]

Vault documentation change

Vault product documentation no longer publishes from the /website directory.

The Vault docs now live in the hashicorp/web-unified-docs repo under /content/vault/.

You can still contribute to Vault docs by created a PR under hashicorp/web-unified-docs:

• For content changes related to the monthly Vault update, submit PRs against the monthly update branch (e.g., vault/202509).

• For content changes related to an upcoming Vault release, submit PRs against the RC release branch (e.g., vault/1.21.x).

• For version-agnostic updates like typos, corrections, and broken links, submit PRs against the main branch.