[fix] Issues with composer and enhanced makefile

[jorgemuza]

-Fix small typos in README file
-Enhanced docker file to copy composer on app container
-Enhanced makefile to remove orphans and volumes

[munza]

@jorgemuza Thanks for the PR 😄

The composer executable was intentionally not copied in the image. The image is intended to be used as a production image and don't require composer. We can use make composer to start an sh session with composer command available.

If there is a need for composer command to be available in prod environment then it can be added additionally and not copied by default.

I would suggest to either not copy it in the image or at least comment it out and add a note above so it can be used if necessary. Eg.

# Notes about not having it in the image...
# COPY --from=vendor /usr/bin/composer /usr/bin/composer

[munza]

@jorgemuza

Loved the changes in the Makefile 👍
And fixing those typos 💯

[munza]

Removing volumes with -v is risky. Developer may not want to delete the volumes when they want to remove only the instances with down command.

I will suggest the following instead -

down: ## Down all Docker services
    @docker-compose down

remove: ## Remove all Docker instances, images, volumes and networks
     @docker-compose down -v
     @docker rmi -f lumen-api-starter-app