Age and popularity columns missing from search results

In https://issues.sonatype.org/browse/NEXUS-8773 and m4 we removed age and popularity columns from search results. We are now launching pro and unless there's a reason not to or this has become unwanted, these can be restored.

I noticed this while reviewing search documentation and that the columns were still referenced. I have commented out that area for now and referenced this ticket. If this is decided wontdo that commented section can be removed. Otherwise it should be reviewed for accuracy. It's in chapter-using-nexus-ui.asciidoc.

Screens show the screenshot from doc and it not showing in search. It does show in asset details (also shown in screen).