Modify Track Hub facade to show a different "please start IGB" message

Currently, the IGB Track Hub Web sites show a tiny popup window at the bottom right corner of the page. The popup appears if IGB is not running and the user clicks an "open in IGB" link.

The current popup is very unobtrusive and is easy to miss. Also, it lacks a link leading to the IGB download page. For new users, this could be a blocker, as they might not know what to do next.

To address this, I would like to change this popup so that it looks like the popup message appearing on the Genome Dashboard site.

The popup that appears on the Genome Dashboard site works better for this purpose because:

• It appears on the upper middle of the page and is also very large - impossible to miss
• It has a link to the IGB download page

Relevant links:

Code with the "popup" message I want to use:

• IGB Genome Dashboard interface - https://bioviz.org/genome-dashboard
• IGB Genome Dashboard codebase - https://bitbucket.org/lorainelab/genome-dashboard/src/master/

IGB Track Hub Facade interfaces (there are two):

• Big table with UCSC trackhubs - https://bioviz.org/public-trackhubs.html
• IGB Track Facade simple converter interface - https://translate.bioviz.org/
• Code base for the converter and the simple converter interface - https://bitbucket.org/lorainelab/hub-facade/src/main/
• Code base for the big table with UCSC trackhubs - https://bitbucket.org/lorainelab/bioviz/src/main/htdocs/trackhub-converter.html
• Code for deploying bioviz web site (with big table) - https://bitbucket.org/lorainelab/bioviz-playbooks