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.

General Policy : https://cdn.kleros.link/ipfs/QmU2GuwcSs8tFp8gWf5hcXVbcJKRqwoecNnERz9XjKr18d
Good Practices : https://cdn.kleros.link/ipfs/QmcCyR68RmwWfdVKinY8Fmiy73a6xEzGqYDcvAh9EFUnLF

Design : https://www.figma.com/design/b7DEUKDeHlOl4ocDTMv7UIhZ/Kleros?node-id=23776-67710&m=dev

[ManiBAJPAI22]

@tractorss

Kindly, review this PR!

Thanks!