refactor: move Zoltan to former editor

[danielpeintner]

I moved to @zolkis to former editor

I have 2 questions:

• is there any specific order of the list we need to respect?
• for Nimura-San ) (@knimura) … add "when" at Fujitsu Ltd. also? I think he is no longer with Fujitsu?

resolves #583

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[zolkis]

Thank you Daniel!

I suggest to follow the practice used in other specs, e.g.
https://www.w3.org/TR/webnn/
with separate list for Editors, and then Former Editors.
In parenthesis, the affiliation when contributing to the spec.
If a person is not any more affiliated with that company (like in my case), that can be indicated with the "while at " prefix.