For a better SEO of the upstream docs website, add the :description: and :keywords: AsciiDoc attributes in the metadata block (before the title) in every file in the pages directories in the master branch.

The pages to check:

• https://github.com/eclipse-che/che-docs/tree/master/modules/administration-guide/pages
• https://github.com/eclipse-che/che-docs/tree/master/modules/end-user-guide/pages

See: https://docs.antora.org/antora/latest/page/title-and-metadata/#page-description-and-keywords