Clean up categories in bulk

[MirandaEcho]

Based on the Category Cleanup tab in this spreadsheet: https://docs.google.com/spreadsheets/d/1eIC4Nu_p5_VYnhqECK1F0rInqsjznTis81nlJIABjSo/edit#gid=214257762

[benlk]

We can do this by hand or with a plugin; by hand for the 5 categories listed, encompassing 106 + 136 + 94 + 149 + 934 = 1419 posts, could be done in less than an hour.

Category	Count	REMOVE	REPLACE WITH:	NEW CATEGORIES TO ADD
CommunityWire	106	TRUE		delete content
The Work Site	136	TRUE		merge with economy
UrbaNERD	94	TRUE		merge with government
Must Reads	149	TRUE
Bronx News Network	934	TRUE		would be great to just have these as part of Bronx Bureau