add support page

content/support.md

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+For questions and support with Cogent Core, you can use the [#cogentcore](https://gophers.slack.com/archives/C07ENRTB2F7) channel on the Gophers Slack.
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+For bug reports, feature requests, and questions, you can create issues and discussions in our GitHub [repositories](https://github.com/cogentcore).
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+You can also ask questions in the Cogent Core [mailing list](https://groups.google.com/g/cogentcore) if you prefer that format.
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+For private inquiries and consulting, you can send emails to [contact@cogentcore.org](mailto:contact@cogentcore.org).
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+For security vulnerabilities, you can send emails to [security@cogentcore.org](mailto:security@cogentcore.org).