CSP-compatible output via external script for build-docs

[MelleD]

When using @redocly/cli build-docs to generate a static HTML file, ReDoc injects the entire rendered state as an inline <script> block:

<script>
  const __redoc_state = { ... }; // entire OpenAPI spec serialized here
  var container = document.getElementById('redoc');
  Redoc.hydrate(__redoc_state, container);
</script>

This inline script violates Content Security Policy (CSP) directives that disallow 'unsafe-inline' for script-src. In many enterprise setups, the CSP is enforced by an API gateway or reverse proxy and cannot be modified by the application team, making it impossible to whitelist inline scripts.