Deployed to Heroku and created Instruction for Heroku Deployment

[DARK-art108]

Description

Deploy the web app to Heroku, this will be helpful for testers.

Fixes #1135

Type of Change:

Delete irrelevant options.

• Code
• Documentation

Code/Quality Assurance Only

• This change requires a documentation update (software upgrade on readme file)
• New feature (non-breaking change which adds functionality pre-approved by mentors)

How Has This Been Tested?

The Heroku app is deployed on https://vms-r.herokuapp.com/ and tested

Checklist:

Delete irrelevant options.

• I have commented my code or provided relevant documentation, particularly in hard-to-understand areas

Code/Quality Assurance Only

• My changes generate no new warnings
• My PR currently breaks something (fix or feature that would cause existing functionality to not work as expected)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been published in downstream modules

[codecov]

Codecov Report

Merging #1159 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1159   +/-   ##
========================================
  Coverage    87.18%   87.18%           
========================================
  Files           85       85           
  Lines         4057     4057           
  Branches       237      237           
========================================
  Hits          3537     3537           
+ Misses         450      449    -1     
- Partials        70       71    +1     

Impacted Files	Coverage Δ
vms/event/views.py	77.63% <0.00%> (-1.69%)	⬇️
vms/shift/views.py	63.40% <0.00%> (+0.79%)	⬆️

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[isabelcosta]

This is awesome, I want to look more into the instructions, but you validated something I was suspecting, there are changes needed in the code to make it automatically used by Heroku. Can you create those files as part of your changes and add them to this PR, please?