Remove background folder

1-introduction/figures/icons/attributions.md

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+- <https://thenounproject.com/icon/finger-pointing-4230431/>
+- <https://thenounproject.com/icon/finger-pointing-4230346/>
+- <https://thenounproject.com/icon/vibration-6478365/> from <https://thenounproject.com/creator/iconbunny/>
+- <https://thenounproject.com/icon/hololens-1499195/> from <https://thenounproject.com/creator/daniel2021/>
+- <https://thenounproject.com/icon/hololens-sideview-966758/> from <https://thenounproject.com/creator/henningg/>
+- <https://thenounproject.com/icon/hololens-973887/> from <https://thenounproject.com/creator/henningg/>
+
+## by [Gan Khoon Lay](https://thenounproject.com/creator/leremy/) / [CC BY](https://creativecommons.org/licenses/by/3.0/)
+
+- grab
+- accuse
+- turning knob
+- pressing button
+- <https://thenounproject.com/icon/hand-using-mouse-4230206/>
+- <https://thenounproject.com/icon/hand-using-phone-4230292/>
+- <https://thenounproject.com/icon/hand-getting-cream-4230201/>
+- <https://thenounproject.com/icon/pressing-button-4230381/>
+- <https://thenounproject.com/icon/hand-holding-a-cube-4230175/>
+- <https://thenounproject.com/icon/take-a-break-4230351/>

1-introduction/figures/icons/noun-vibration-6478365.svg

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