Shell script build.sh refactorization

[brunolnetto]

Pull Request

Contribution checklist

• Create an issue to discuss features and bugs: [FEATURE] Suppress verbosity from build.sh  #87;
• Fork the project: https://github.com/brunolnetto/spark-standalone-cluster-on-docker
• Create your feature branch, we use gitflow: committed to my master;
• Do your magic 🌈 : done;
• Commit your changes: committed to my master;
• Push to your feature branch: pushed to my master;
• Create a new pull request from your feature branch to the develop branch: done;

Changes

The script build.sh does its work, great! I add some structure to make it programmatically well build. Furthermore, I add a subsection "How to start" to encapsulate both docker-hub pull and local machine startups.

• docs/ how to start subsection
• refac/ improve current build script with general build structure
• docs/ how to start subsection
• docs/ easier->easiest
• config/ prepare Dockerfilerefac/ quiet install
• refac/ arrays and image clean parenting

Checklist

Please make sure to check the following:

• I have followed the steps in the CONTRIBUTING.md file.
• I am aware that pull requests that do not follow the rules will be automatically rejected.