Create MIGRATE.md

MIGRATE.md

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+Migrating from Ruhoh
+====================
+
+There are only a few things in Ruhoh that could only be done in ruby or were otherwise difficult to work around.
+
+config.yml
+----------
+
+Instead of having special names for some properties (`_root`)
+and `use` sub attributes for others (`twitter` theme, posts directory),
+I opted to move related stuff together.
+
+```
+RuhohSpec 2.6 -> NuhohSpec 3.0
+
+production_url -> production.canonical_url, development.canonical_url
+base_path -> production.base_path, development.base_path
+compiled_path -> development.compiled_path
+
+twitter -> themes.twitter
+twitter.use = theme -> themes.default = twitter
+
+_root -> root
+
+posts -> collections.posts
+
+asset_pipeline [REMOVED (ruby only)]
+
+widgets [NO CHANGE]
+```
+
+data.yml
+--------
+
+No changes
+
+
+config.ru
+---------
+
+REMOVED (ruby only)
+
+themes layout
+-------------
+
+TODO
+
+`twitter/default.html` has stuff like `{{# data.navigation?to__root }}{{> page_list }}{{/ data.navigation?to__root }}`
+that appears to be ruby-only syntax that will need to be changed.