Separate real OSGi bundles from simple JARs in Downloads page

Currently the page https://sling.apache.org/downloads.cgi#sling-components has a section "Sling Components" which contains most of the Sling modules. However not all in that list are bundles.
Therefore I propose to rename "Sling Components" to "Sling Bundles" (and only list real OSGi bundles there) and add an additional section named "Sling Helpers" and list all JARs there which do not fit in any other category (maven plugins, bnd plugins, IDE or Sling Application).

Those are primarily all annotation modules like

• https://github.com/apache/sling-adapter-annotations
• https://github.com/apache/sling-org-apache-sling-adapter-annotations
  but also
• https://github.com/apache/sling-org-apache-sling-installer-provider-installhook
  ...