Remove creation of DB extensions from INSTALL.md

This point of the installation is now obsolete as the extensions are
installed by gvmd.

INSTALL.md

@@ -145,22 +145,13 @@ Certificates`.
     grant dba to mattm;    # mattm is the user created in step 3
     ```
 
-5.  Create DB extensions (also necessary when the database got dropped).
-
-    ```sh
-    sudo -u postgres bash  # if you logged out after step 4
-    psql gvmd
-    create extension "uuid-ossp";
-    create extension "pgcrypto";
-    ```
-
-6.  Make Postgres aware of the gvm libraries if not installed
+5.  Make Postgres aware of the gvm libraries if not installed
     in a ld-aware directory. For example create file `/etc/ld.so.conf.d/gvm.conf`
     with appropriate path and then run `ldconfig`.
 
-7.  Run Manager as usual.
+6.  Run Manager as usual.
 
-8. To run SQL on the database.
+7. To run SQL on the database.
 
     ```sh
     psql gvmd