Show 'General Policy' and 'Good Practices' document in Navbar dropdown

[tractorss]

Include 'Policies' dropdown at the navbar where we can have an easy access to the 'General Policy', and 'Good Practices' document.

Design : https://www.figma.com/design/b7DEUKDeHlOl4ocDTMv7UIhZ/Kleros?node-id=23776-156327&t=wjreYqINUGCn1XyA-0