text: Title: Docs need different path to images
  Body: https://igel.readthedocs.io/en/latest/_sources/readme.rst.txt includes a link to the assets/igel-help.gif, but that path is broken on readthedocs. 
  
  readme.rst is included as ../readme.rst in the sphinx build.
  The gifs are in asses/igel-help.gif
  
  The sphinx build needs to point to the asset directory, absolutely:
  
  .. image:: /assets/igel-help.gif
  
  I haven't made a patch, because I haven't tested this.