Modify sign in flow on all dapps

[fzavalia]

When the user wants to sign in into a dapp. They will be redirected to the auth site. Once the sign in is complete. They will be redirected back to the original site.

For example:

• User visits decentraland.org/market and want to connect
• User is moved to decentraland.org/auth
• User signs in
• User is redirected back to decentraland.org/market

Apps to update:

• Market
• Builder
• Account
• Profile
• Places
• Events
• Rewards
• Dao
• Governance

Play is to be updated on a different task.