Preview tells that it still doesn't work. Since Sphinx supports both Markdown and ReST. Maybe it's easier to switch index.rst to index.md instead?

Preview tells that it still doesn't work.

I added blank lines before the badge line. Now, at least the indent is correct.

Since Sphinx supports both Markdown and ReST. Maybe it's easier to switch index.rst to index.md instead?

I tried this locally but so far I did not manage that the badge image is displayed correctly.

So, I found that using a table can be helpful here. With these changes it get this:

I could also add the bold style to the version numbers to be consistent with the list for the papers.

@seisman what do you think?

Ping @GenericMappingTools/gmt-docs and @seisman for comments on using a table here.