docs(community-links): add printer link

[egorlem]

Adds apollo-link-printer to the community link directory

[apollo-cla]

@egorlem: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[netlify]

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Latest commit: d663b6e

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[jerelmiller]

Neat project! Thanks for adding it to the list!