Drop View-latest button for Next release

[chalin]

• Closes View-latest button should be disabled/absent for future releases #721
• Only the 2.7 pages are affected by this PR:

  $ (cd public && git diff) | grep ^diff | grep -v 2.7
  $

Previews:

• https://deploy-preview-723--keda.netlify.app/docs/2.7/scalers/aws-dynamodb/, page title has no View-latest button
• https://deploy-preview-723--keda.netlify.app/docs/2.6/scalers/activemq/, still has a Latest tag
• https://deploy-preview-723--keda.netlify.app/docs/2.4/scalers/cron/, still has a View-latest button

[netlify]

✅ Deploy Preview for keda ready!

Name	Link
🔨 Latest commit	3a8cf3a
🔍 Latest deploy log	https://app.netlify.com/sites/keda/deploys/623a472656ce550009ea665c
😎 Deploy Preview	https://deploy-preview-723--keda.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[zroubalik]

LGTM, thanks!