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.

• [x] 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[bot]]

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%)	:arrow_down:
vms/shift/views.py	63.40% <0.00%> (+0.79%)	:arrow_up:

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