Transition to a new url scheme to match the walrus protocol

[Tzal3x]

Description

Currently a URL is linked to a specific aggregator / portal like this https://blobid.walrus/<PATH>.
It would be cleaner to transition to a separate protocol for a client to talk to an aggregator.

For example, IPFS handles this by having an ipfs:// protocol that clients redirect to whatever way they have to get IPFS blobs.

We should do something similar with walrus sites.

Example schemes:

• wsite://
• walrus://

OR

Use the web+walrus  and web+blob  protocol registrations.

Component

portal

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