[FORMATTING] Footnotes

**Describe your suggestion**

I would like to have footnotes in superscript, plus bold! Superscript because it's less disturbing, and bold because it will be more visible (now that footnotes are at the very end of each part, not at the end of a page, they get less visible).

If it's not possible to achieve the superscript part, I'd still like it to be bold.
