fix:slack button url

[Nayhay99]

Notes for Reviewers

This PR fixes opening intended slack URL on button click.

• Replaced the button href prop with url prop
• Removed the styling of <a> tag inside join-community section as
  • it over-rid the button style by adding a yellowish background to the button which should have teal background color only
  • No other <a> tag present inside the section, hence I think styling it was unnecessary.
  • To maintain consistency, <Button/> component should be used along with url prop and the styling should be applied on the button instead of <a> tag.

Signed commits

• Yes, I signed my commits.

[netlify]

✅ Deploy Preview for meshery-play ready!

Name	Link
🔨 Latest commit	9efbed1
🔍 Latest deploy log	https://app.netlify.com/sites/meshery-play/deploys/674e0e1911ec3400083b206d
😎 Deploy Preview	https://deploy-preview-230--meshery-play.netlify.app
📱 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.

[Nayhay99]

Request your review @leecalcote

[Nayhay99]

#229

[Nayhay99]

@leecalcote Were you able to review the PR?

[leecalcote]

@Nayhay99, if you get a chance to join the weekly Meshery Dev meetings, I highly encourage you to jump in ---> https://meshery.io/calendar

[leecalcote]

These changes look great. ✅ Thank you for your diligence in how you identified the bug, proposed a fix, and implemented it, @Nayhay99. 🥇

[Nayhay99]

@Nayhay99, if you get a chance to join the weekly Meshery Dev meetings, I highly encourage you to jump in ---> https://meshery.io/calendar

Sure! Will join. Thank you

[Nayhay99]

These changes look great. ✅ Thank you for your diligence in how you identified the bug, proposed a fix, and implemented it, @Nayhay99. 🥇

Looking forward to contribute and learn more. Thank you!