adds decentralization blog post

[Frijol]

I'm proud to present our final blog post for the year: Decentralization!

@b5 @RangerMauve @ericnost @titaniumbones @dcwalk @StefanMorales & others whose Github handles I don't have– please review!

In particular, please:

1. Add yourself as an author if you would like to be acknowledged as an author (after all, you're the source material)
2. Double check that the things I said you said actually sound like something you would say. As usual, I did some pretty severe editing to shorten and improve coherence, so it's possible I've totally misconstrued your meaning
3. In light of the above, another option is to have your name changed to an alias if you would prefer.

Ideally we'd post by the New Year but perhaps that's too quick of a turnaround– how about, comments in by new year & I'll publish by Jan 6th

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Publication checklist (to do upon merging):

• [x] Merge https://github.com/datatogether/reading_datatogether/pull/81 to put the blog post link in the reading group readme
• [x] Merge https://github.com/datatogether/reading_datatogether/pull/82 to save the finalized 2019 semester overview to the notes folder
• [x] Merge https://github.com/datatogether/website/pull/97 to update the final syllabus on the website
• [ ] (after the above) merge https://github.com/datatogether/reading_datatogether/pull/83 to kick off the next semester

[Frijol]

What would the format for adding myself as an author be? :o

@rangermauve line 6, after my name!