Cdkize cdks website

[martzmakes]

Issue #, if available: Call for help on slack re: cdkizing the site and providing a way to generate a slack invite url on demand

Description of changes: Note: this is incomplete... hard for me to go further without access I don't have (AWS Account / slack admin). I'm not asking for that but this should get you very close. I cdk -ized the site... created a distribution bucket / cloud front distribution + lambda that will redirect to a slack invite link. If you set up whatever secrets are needed in a secure string in parameter store (cheaper / should be within limits vs secrets manager) you can finish the cdk/slack-join.ts lambda to make that call and finish the redirect. A custom resource uploads a config.json file with the lambda's function url... react requests that and uses that as the invite link.

Happy to make any changes and/or collaborate as needed.

Note: I generally try to avoid yarn but used it here since the repo used it... so I'm certain I'm not following yarn best practices 😅

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cc: @mbonig