.github: update question.md template

Some other links in the question.md template for new issues
still had an older link, and inconsistent capitalisation.

This commit addresses those.

.github/ISSUE_TEMPLATE/question.md

@@ -8,7 +8,7 @@ Issues on GitHub are intended to be related to bugs or feature requests, so we
 recommend using our other community resources instead of asking here if you
 have a question.
 
-- Packer Guides: https://www.packer.io/guides
-- Any other questions can be sent to the packer section of the HashiCorp
+- Packer Guides: https://developer.hashicorp.com/packer/guides
+- Any other questions can be sent to the Packer section of the HashiCorp
   forum: https://discuss.hashicorp.com/c/packer
-- Packer community links: https://www.packer.io/community
+- Packer Community: https://developer.hashicorp.com/packer/community