Script to remove user and make their entries anonymous

Script will find a user by provider id, find the all entries where they
are a submitter or review, and change the submitterId or reviewerId to
the site's anonymous user, then the user will be removed.

`$ npm run anonymize_user -- <provider id>`

The flag `-d` can be passed to perform a dry-run, where the user id, and
relevant entry ids will be printed, but no changes made.

README.md

@@ -99,15 +99,20 @@ To update the translations cache, run:
 
 Any column can be internationalised by adding another column with `@locale` after it. For example, the `description` column can be translated to German by adding a column of `description@de`. Only languages which have template translations created for them are valid. The `locales` setting in the config document can be used to restrict the number of locales available. The first locale in the list is the default locale.
 
+### Removing a user
+
+A script is provided to remove users by provider id. Removing a user will update entries where the user is a submitter or reviewer (changing the user id to the anonymous user), then remove the user.
+
+`$ npm run anonymize_user -- <provider-id>`
+
+Use `-d` to perform a dry run, which will print the user id, and entry ids which will be affected (where the user is either a submitter or reviewer).
+
+
 ### Running Tests
 
 ```
 createdb opendatacensus_test
 npm test
 ```
 
-------
-
-## Heroku Deployment
 
-TBD: This section needs to be updated. The basics of deployment now are just to use the normal heroku commands, as now, one codebase powers multiple census sites.