src/config.ts: add Gitpod to the known cloud-based IDEs

[svenefftinge]

This change adds Gitpod to the recognized cloud-based IDEs to avoid showing the welcome screen in every workspace.

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[svenefftinge]

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Patch Set 1: Run-TryBot+1 Code-Review+2 Trust+1

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This PR (HEAD: 070a46a) has been imported to Gerrit for code review.

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Patch Set 2: Run-TryBot+1 Code-Review+2 Trust+1

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This PR is being closed because golang.org/cl/333489 has been merged.