docs : improved the docker image , docker-compose and Dockerfile.

[husainattar]

Description

Updated the docker-compose.yml,settings.py, Dockerfile and Readme.md
for easy project installation process through docker.

Fixes # 915

Type of Change:

Delete irrelevant options.

• Code
• Documentation

Code/Quality Assurance Only

• Bugfix (non-breaking change which fixes an issue)

How Has This Been Tested?

Checklist:

Delete irrelevant options.

• I have performed a self-review of my own code or materials
• I have commented my code or provided relevant documentation, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Code/Quality Assurance Only

• My changes generate no new warnings

[theyashshahs]

@husainattar please change the PR title according to the commit styles

[husainattar]

Yes sure @yashshah2820. One more thing that this issue wasn't labelled so I have just labelled the PR under docs same as the portal docker issue #581.

[theyashshahs]

@husainattar squash the commits into one as you have 13 commits in the PR

[husainattar]

Hi @yashshah2820 I have squashed the commits and resolve the error due to which PR's build failed and Before squashing comments all test passed but now travisCI failed.

[theyashshahs]

@husainattar coverage tests are failing

[husainattar]

I am sorry @yashshah2820 actually I am not familiar with testing I will be grateful if anyone can help me to resolve this because pull request build was successful before squashing comments.