Remove wallet ids and use client pubkeys

[im-adithya]

Also includes moving to /:pubkey/settings etc. routes so we don't do stuff like fetching selectedWalletId from the store in each screen.

This would also help in eliminating the case where the same connection string is added multiple times and mainly the instances where wallet ids are decremented by 1 on deleting a wallet, which looks very bad.

[rolznz]

The reason to use ids is so we can easily find out which wallets in storage we know about. Is there a better way to do it? a key that has a list of wallet pubkeys?