Make upgrade guides more self-service discoverable

[BigLep]

We have an upgrade guide in https://github.com/ipfs/js-ipfs/blob/master/docs/upgrading/ . In my quick check, I didn't see anything linking to this from https://github.com/ipfs/js-ipfs.

[welcome]

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[achingbrain]

The readme should have an upgrading section linking to the docs/upgrading folder as in the opening post.

If someone would like to create a quick PR to do this it would be much appreciated.

[whizzzkid]

js-ipfs is being deprecated in favor of Helia. You can follow the migration plan here #4336 and read the migration guide.

Please feel to reopen with any comments before 2023-06-05. We will do a final pass on reopened issues afterward (see #4336).