"Join Us" application date change

[manforowicz]

• Modifies the join webpage.
• Adds the info: "2023 applications will open on September 20 and close on October 6.".
• Disables the apply button.

[netlify[bot]]

✅ Deploy Preview for huskysat ready!

Name	Link
🔨 Latest commit	b7bbda20da0b1ff4a3965377602fc180cd9d9f66
🔍 Latest deploy log	https://app.netlify.com/sites/huskysat/deploys/64ece9746d68910008cee1e0
😎 Deploy Preview	https://deploy-preview-2--huskysat.netlify.app/join
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[AlnisS]

Switched it to be the embedded mailing list form: https://docs.google.com/forms/d/1KzGycpKxuU64nMo2JXn6pDA-ioibJ7PY9SYaFj51oAc/edit

@karenhaining assigning to you to review & accept PR when it looks good to you.

Thanks @manforowicz !