Fixed anchors for sub-items in TOC

[sgrepos]

This template fix links each sub-item to the appropriate anchor. See the TOC box on http://creativecommons.github.io/contributing-code/, and you'll notice all the sub-item anchor links are currently not right.

Before this update:

After:

Closes #XX

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md)
• My pull request targets the master branch of creativecommons.github.io-source.
• I tried building the site using Lektor locally and verified that there are no build errors.

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(b) The contribution is based upon previous work that, to the best
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by me, under the same open source license (unless I am
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[kgodey]

Thanks for fixing!