update readme and cleanup dockerfile (#109)

* update readme with connect db step

* remove extra lines from dockerfile

Dockerfile

@@ -10,20 +10,7 @@ ENV HASURA_GRAPHQL_DEV_MODE=true
 # https://devcenter.heroku.com/articles/heroku-postgres-plans#hobby-tier
 ENV HASURA_GRAPHQL_PG_CONNECTIONS=15
 
-# Change $DATABASE_URL to your heroku postgres URL if you're not using
-# the primary postgres instance in your app
 CMD HASURA_GRAPHQL_METADATA_DATABASE_URL=$DATABASE_URL graphql-engine \
     serve \
     --server-port $PORT
 
-## Comment the command above and use the command below to
-## enable an access-key and an auth-hook
-## Recommended that you set the access-key as a environment variable in heroku
-#CMD graphql-engine \
-#    --database-url $DATABASE_URL \
-#    serve \
-#    --server-port $PORT \
-#    --access-key XXXXX \
-#    --auth-hook https://myapp.com/hasura-webhook 
-#
-# Console can be enable/disabled by the env var HASURA_GRAPHQL_ENABLE_CONSOLE

README.md

@@ -31,12 +31,19 @@ Heroku](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?
 ### 2. Open Hasura Console
 
 Once the deployment is complete, click on the `View` button as marked above.
-This will take you to the Hasura Console, where you can create a table and make
+This will take you to the Hasura Console, where you can connect your database, create a table and make
 your first GraphQL query. 
 
 ![Hasura Console](https://graphql-engine-cdn.hasura.io/heroku-repo/assets/hasura_console.png)
 
-### 3. Create a table
+### 3. Connect a database
+
+Head to the `Data` tab on the console and connect your database. If you do not have an existing database, you can connect to the 
+Heroku Postgres database that was set up with your deployment using the `DATABASE_URL` env var.
+
+![heroku_connect_db](https://graphql-engine-cdn.hasura.io/heroku-repo/assets/heroku_connect_db.png)
+
+### 4. Create a table
 
 Navigate to `Data -> Create table` on the console and create a table called
 `profile` with the following columns:
@@ -50,7 +57,7 @@ Choose `id` as the Primary key and click the `Create` button.
 
 ![Hasura Console - Create table](https://graphql-engine-cdn.hasura.io/heroku-repo/assets/hasura_create_table.png)
 
-### 4. Insert sample data
+### 5. Insert sample data
 
 Once the table is created, go to the `Insert Row` tab and insert some sample
 rows:
@@ -64,7 +71,7 @@ Black Widow
 
 ![Hasura Console - Insert rows](https://graphql-engine-cdn.hasura.io/heroku-repo/assets/hasura_insert_row.png)
 
-### 5. Try out GraphQL
+### 6. Try out GraphQL
 
 Switch to the `GraphiQL` tab on top and execute the following GraphQL query: