Revert "Update Site's REST Catalog Spec Reference to Bundled Polaris …

[HonahX]

…+ Iceberg API YAML (#935)"

This reverts commit 3685065.

This reverts #935 because it breaks the site unexpectedly with error, although locally everything works fine

Refused to load the script 'https://cdn.jsdelivr.net/npm/redoc@latest/bundles/redoc.standalone.js' because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-inline' 'unsafe-eval' https://analytics.apache.org/". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback.

While exploring the issue, I think we should first revert the change to make site work again

cc @flyrain