clarify links to issues vs. list of open issues

[JCSzamosi]

This pull request seeks to clarify the How to Contribute section by moving the link to https://carpentries.org/help-wanted-issues/
to point 3, and replacing it in point 2 with a new link to the repo's Issues tab. This is following up on this discussion.

[github-actions]

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⏱️ Updated at 2023-06-12 15:53:43 +0000