chore(helmet): remove unused middleware

[YashKumarVerma]

Description

• removed code for integrating Helmet
• Fixes #54

Motivation and Context

as described in issue #54,

How Has This Been Tested?

• the code is already commented out, removing it has no impact on the application/test suite.

Screenshots (if appropriate):

Types of changes

**What types of changes does your code introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Refactor

Checklist:

Go over all the following points, and put an x in all the boxes that apply. (If you're unsure about any of these, don't hesitate to ask. We're here to help!)

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[birm]

While cleaning out unused code isn't a bad idea, I don't consider this a solution to #54

[YashKumarVerma]

alright, sounds fair.

I'll close this in favour of #83