specify Node and Go versions in CONTRIBUTING.md

[kevinpan47]

npm install errors out when using Node v16.14.0 for me, but works when I changed to the version to v13.14.0.

I know you can see which Node/Go versions are used from the Dockerfile, but it would still be convenient if the contribution doc specified using you were using Node v13.14.0 (node:13-alpine) and Go v1.19.8 (go:19-buster).

[kevinpan47]

I also noticed that the Dockerfile and go.mod are using different versions of Go (1.19 vs 1.20). Prob not a big deal but may want to make these consistent.

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