Remove divider borders from desktop submenu items

[david-poindexter]

Related to Issue

Fixes #313

Description

• Clean up _nav.scss code formatting
• Commented border styling just in case others would like to have the borders in their theme design.

How Has This Been Tested?

Local development environment.

Screenshots (if appropriate):

Types of changes

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

Checklist:

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

[sonarcloud[bot]]

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