Fix navbar dropdowns overflow bug

[modularcoder]

Pull request type

Noticed that sometimes the Navbar Dropdowns are partially hidden behind the main page content. Apparently Navbar should have higher z-index than the page container

Please check the type of change your PR introduces:

• [x] Bugfix
• [ ] Feature
• [ ] Other (please describe):

Pull request checklist

Please check if your PR fulfills the following requirements:

• [ ] If it's a backend change, tests for the changes have been added and go test ./... runs successfully from the root folder.
• [x] If it's a frontend change, Prettier has been run
• [x] Docs have been reviewed and added / updated if needed

What is the current behavior?

What is the new behavior?

Technical Spec/Implementation Notes

Increased StyledNavbar z-index value to 2