fix: broken `help-wanted` badges with correct url

[Xunzhuo]

Description

This PR fixes https://github.com/layer5io/.github/issues/12

Notes for Reviewers

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[Xunzhuo]

let me take a quick fix as my first commit to Layer5. :)

[leecalcote]

Oh, my goodness. This one went under the radar. Thank you for this, @Xunzhuo! 👏

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