Don't assume WebID is Solid resource

[langsamu]

contactUtils.addContactToProfile tries to save (PUT) a WebID profile document using an authenticated fetch with the Solid JS SDK:

solid-file-manager/app/lib/helpers/contactUtils.ts

Lines 138 to 139 in 0557525

	// Save the updated dataset
	await saveSolidDatasetAt(profileUrl, updatedDataset, { fetch });

On some Solid server this might work because in some cases WebID profile documents are Solid resources.
But on other Solid servers this fails, because in those cases WebID profile documents are not Solid resources.

There is nothing in the Solid suite of specs that guarantees WebID profile documents being Solid resources (though there is a long standing convention).

This functionality should be either removed or made more robust instead of resulting in an unhandled error.

[saveuni8]

It's maybe for that issue that, trying to upload files of every dimension and type (but always under 65 MB) on my Solid Web File Manager POD, either in the public or in the private storage, I receive the following error: ‘Error: Error: Web error: 413 on PUT of ’? Thanks in advance.