Update route guide

[bjohansebas]

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[UlisesGascon]

Once the discussions are solve, I think that we can land it :)

[bjohansebas]

I've updated the playground on my end to bring it back, as I think it's something good to have on the page. If you'd like, it can be moved to this organization.

Also, this hasn't been moved in a long time, so if there are no objections, I'll merge it by the end of next week.

cc: @expressjs/express-tc @expressjs/docs-wg