Document how to create a completely fresh reinstall of Superset

[metaperl]

Here we read:

create a clean/new virtualenv and reinstall superset and dependencies

without a link to anywhere in the docs stating how to reinstall superset and erase any previous install. for instance, the database in $HOME/.superset/superset.db needs to be removed for a new installation to truly work.

reinstalling superset without doing so will create database clashes when you attempt to create the admin user.

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[dpgaspar]

Hi @metaperl,

The default database location is referenced here: https://superset.apache.org/installation.html#configuration

Don't know if updating the docs stating that user's can/should remove sqllite db on a reinstall is the right way to go, could further increase confusion around the process.

Yet, I'll update flask-appbuilder so that flask fab create-admin won't raise an exception if a user already exists

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