add query string parameters for setting panel width

[makerslabemlyon]

Currently writing a course and embedding codepan iframes for experimenting with JS, yet having large console is a design problem for integration. I was thinking about something like what Glitch does: https://glitch-embed.glitch.me/#preview

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• #70 iframe width and tabs

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[jacek-goblin]

This #75 Pull request includes tabs as GET parameters

[jacek-goblin]

cc @makerslabemlyon