Add dev.to link to footer and community page

[benhalpern]

DEV Community is a burgeoning source of guidance and discussion on software topics, especially web dev. This will be a useful link to point to the official place to discuss React matters on the platform.

A few additional links pertaining to dev.to

Traffic stats: https://www.similarweb.com/website/dev.to
Twitter: https://twitter.com/thepracticaldev
grpc tag (as included in PR): https://dev.to/t/grpc

Some example grpc posts:
https://dev.to/joaofbantunes/dotnetifying-grpc-5ni
https://dev.to/lucasfrota/explain-grpc-like-im-five-26mm

Screenshots:

This is following a pattern of this link's inclusion on sites like reactjs.org

Happy coding ❤️

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[benhalpern]

Signed ✅

[benhalpern]

Hey folks, sorry to be a bother, any status on this PR?

[hsaliak]

@benhalpern i find myself going to dev.to often these days (the speed at which it loads is impressive) due to the quality of content there. However I am hesitant to merge this PR.

We have a few limited and curated forums through which we manage community engagement. We (committers) have rotations to monitor these forums and respond quickly. Adding one more forum is going to spread us too thin (once could argue that we already are!).