display submission link in-place on page

When submitting a new selection, wrap the entire selection in anchor <a>
tags, turning the text into a custom hyperlink.

This approach has a few benefits:
- it provides a preview of exactly what content subsequent viewers will
see
- it's mindful of the custom layout of the page -- specifically, any
'sticky' elements like footers or sidebars that might hide our display
information
display loading message in place of button
update comment with result object details