[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2852: move NEWS.rst into docs/, add to readthedocs build

[Tahoe-LAFS]

#2852: move NEWS.rst into docs/, add to readthedocs build
---------------------------+------------------------
 Reporter:  warner         |          Owner:
     Type:  task           |         Status:  new
 Priority:  normal         |      Milestone:  1.13.0
Component:  documentation  |        Version:  1.12.0
 Keywords:                 |  Launchpad Bug:
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 While wrangling the 1.12.0 release, I discovered that NEWS.rst isn't as
 easy to reference as our other docs, because it doesn't live in docs/ (and
 thus cannot be part of the Sphinx build that gets published on
 readthedocs.io).

 So the task is to move it down into docs/, update the index to include it,
 and update any pointers (maybe in README, maybe on the web site / wiki).
 And also to check on the formatting, make sure things render properly (but
 are mostly readable as plain text).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2852>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage