Added avatar generation functionality and logout button to user profile

[mlipscomb24]

Added avatar functionality:

• Users can now generate random avatars
• Added avatar field to User model
• Integrated DiceBear API for avatar generation
• Updated Profile and UserHeader components
• Added necessary GraphQL mutations and queries

[mlipscomb24]

can use this image if we want for the ReadME just needs to be added to the public folder