Create content for FAQ

The current preview: https://eclipsefdn-asciidoc-wg.netlify.app/about/faq/

Page for the FAQ: https://github.com/EclipseFdn/asciidoc.eclipse.org/blob/main/content/about/faq/index.adoc

Content of the FAQ: https://github.com/EclipseFdn/asciidoc.eclipse.org/blob/main/data/en/faq.json