reorganize docs

doc/database.md

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+
+Postgres on Debian:
+
+
+    # install
+    apt-get install postgresql postgresql-client
+
+
+Setting up postgres (as root)
+
+    # become postgres user
+    su postgres
+    # spawn postgres admin shell
+    psql
+
+You'll get a prompt, enter the following:
+
+    CREATE ROLE srnduser WITH LOGIN PASSWORD 'srndpassword';
+    CREATE DATABASE srnd WITH ENCODING 'UTF8' OWNER srnduser;
+    \q
+
+Change the username and password as desired.
+