Sample data fixes

[jkoschinsky]

• when you click on any of the red banners, you get a 404 page not found error
• right now, the blue banner is too large relative to the map (see attached): Could you make that smaller (same extent as text) and the map bigger?
• at https://geodacenter.github.io/data-and-lab/tags/, could you remove the upload date since we only need the name?
• let's disable comments at the bottom ("Comments: We were unable to load Disqus. If you are a moderator please see our troubleshooting guide."
• right now, there's no way to actually download the data :) We could add a "Download" link in the blue banner below the dataset name?

[lixun910]

All fixed except for download links:
For download, it's better to add a download link in each post. e.g.

<a href="xxx">Download Here</a>