Make 'blacklist' a subcommand of 'database'; update README

Author: Koenraad Verheyden

README.md

@@ -142,17 +142,6 @@ docker-compose run web build world
 docker-compose run -v "$(realpath <SOURCE>)":/build web build crate --local /build
 ```
 
-#### `blacklist` subcommand
-
-```sh
-# Adds <CRATE_NAME> to the blacklist
-# Crates on the blacklist will not be built
-docker-compose run web blacklist add <CRATE_NAME>
-
-# Removes <CRATE_NAME> from the blacklist
-docker-compose run web blacklist remove <CRATE_NAME>
-```
-
 #### `database` subcommand
 
 ```sh
@@ -175,6 +164,17 @@ docker-compose run -d db
 docker exec -it <the container name goes here> psql -U cratesfyi
 ```
 
+The database contains a blacklist of crates that should not be built.
+
+```sh
+# Adds <CRATE_NAME> to the blacklist
+# Crates on the blacklist will not be built
+docker-compose run web database blacklist add <CRATE_NAME>
+
+# Removes <CRATE_NAME> from the blacklist
+docker-compose run web database blacklist remove <CRATE_NAME>
+```
+
 #### `daemon` subcommand
 
 ```sh