message: Add 2.0 announcement in docs
diff: @@ -107,7 +107,9 @@ html_theme = "furo"
  # further. For a list of options available for each theme, see the
  # documentation.
  #
  -# html_theme_options = {}
  +html_theme_options = {
  + "announcement": 'CCF 2.0 release candidate <a href="https://github.com/microsoft/CCF/releases/tag/ccf-2.0.0-rc0"> is now available </a>'
  +}
  # Add any paths that contain custom static files (such as style sheets) here,
  # relative to this directory. They are copied after the builtin static files,
  