Allow attributes related to footnotes

[kyntk]

What

• Avoid sanitizing attributes related to footnotes
  • To fix a bug that links to footnotes were disabled

[codeclimate[bot]]

Code Climate has analyzed commit 9e3a59b2 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 98.9% (0.0% change).

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