Fixes #2425 PR #2427 adds a back-to-top button, however the button overlaps with the footer when `footer_fixed: false` and [has inadequate spacing](https://github.com/alshedivat/al-folio/issues/2425#issuecomment-2121670658) with `footer_fixed: true` Changes in this PR: - Fix positioning of button on fixed and sticky footer layouts - Add option to disable back-to-top button by setting `back_to_top: false` in `_config.yml` - Add button transparency to avoid button blocking content view - Reduce size of button Demo - | Device | Fixed footer | Sticky footer | | :-----------: | :-------------: | :-----------: | | Mobile |  |  | | Desktop |  |  | Miscellaneous change - Added personal website under `Academics` to `README.md` |
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| font-awesome | ||
| tabler-icons | ||
| _base.scss | ||
| _cv.scss | ||
| _distill.scss | ||
| _layout.scss | ||
| _tabs.scss | ||
| _themes.scss | ||
| _typograms.scss | ||
| _variables.scss | ||