docs: add passport.js real-world example

[aeneasr]

Create a passport.js example app and include it in docker compose

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Using react for the exemplary identity provider is nice and all, but react is hard to understand for people who do not use react a lot. Instead, a minimalistic nodejs application should be used.

[aeneasr]

See ory/examples#4

[lazycipher]

@aeneasr, It's throwing 404