[openstreetmap/openstreetmap-website] add some notes about importing data to INSTALL.md (PR #3719)

[danieldegroot2]

(also at [CONFIGURE.md#populating-the-database](https://github.com/openstreetmap/openstreetmap-website/blob/b8d83738158e3efc0792ef2c66bb41e846ed28ec/CONFIGURE.md#populating-the-database) )

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