The two links at the bottom of tutorials on Learn Astropy website not working

[kakirastern]

As stated, the two buttons at the bottom of the tutorial pages have faulty links, unlike the two up top, which are working.

If you link on either the "Download tutorial notebook" or "Interactive tutorial notebook" button, it will return a "404 not found" error page, as:

[mwcraig]

A little more information (from the Analyzing UVES Spectroscopy with Astropy tutorial).

The "Download"/"Interactive" buttons at the top of the page work. The same buttons at the bottom of the notebook fail.

The URLs attached to the buttons are:

• "Download..." button
  • Top of page: http://learn.astropy.org/_static/UVES/UVES.ipynb
  • Bottom of page: http://learn.astropy.org/_static//.ipynb
• "Interactive..." button
  • Top of page: https://beta.mybinder.org/v2/gh/astropy/astropy-tutorials/master?filepath=/tutorials/notebooks/UVES/UVES.ipynb
  • Bottom of page: https://beta.mybinder.org/v2/gh/astropy/astropy-tutorials/master?filepath=/tutorials/notebooks//.ipynb

For both buttons at the bottom the UVES/UVES part of the path is missing.

[kakirastern]

Am tracking down the code block(s) for both of these buttons at the bottom to see if I can open a PR to fix it...