Update index.rst

[nsaphra]

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[yoavg]

@nsaphra @pmichel31415 hi, I am trying to figure out the relation between #211 #212 #215 .
#212 definitely goes in, but are #211 and #215 compatible / needed?

[pmichel31415]

I think #212 takes care of #211 and #215 by reorganizing the tutorials

[nsaphra]

@yoavg As far as I can tell, without #215, the changes I made in #210 won't be visible in navigation. Correct me if I'm wrong, but currently the python tutorials don't show up in the index or on the sidebar navigation.

I think #211 should be merged because adding the python tutorials as a separate file made the deleted python tutorial section redundant.

[nsaphra]

I see that #212 reverts back to including python in the main tutorial rather than in its own file and makes #211 and #210 unnecessary. I will close them.