Remove database readme

This duplicates parts of INSTALL.md but with outdated information.

diff --git a/db/README b/db/README
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-Creating database
-===================
-
-OSM server uses a Postgres database with the following name:
-
-openstreetmap
-
-You may create it with your preferable client or run next (linux) command:
-
-$ createdb openstreetmap
-
-Creating functions for PgSQL
-==============================
-
-Run this command in the db/functions directory:
-
-$ make libpgosm.so
-
-You might also need to install:
-- postgresql development libraries:    $ sudo apt-get install postgresql-server-dev-8.3
-- ruby development libraries:          $ sudo apt-get install ruby1.8-dev
-for build to succeed.
-
-Now create the function as follows:
-
-$ psql openstreetmap
-(This may need authentication or a -u <dbowneruid>)
-
-> CREATE FUNCTION maptile_for_point(int8, int8, int4) RETURNS int4 
-  AS '/path/to/rails-port/db/functions/libpgosm.so', 'maptile_for_point'
-  LANGUAGE C STRICT;
-
-Creating database skeleton tables
-===================================
-
-Run this command from the root of your rails directory:
-
-$ rake db:migrate
-
-This will create the db for you
-
-You will need to make sure the database connection is configured in database.yml in config directory
-You might start with example configuration provided: 
-$ cp config/example.database.yml config/database.yml