Added image licencing info

src/web/static/images/IMAGE_LICENCES.md

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+## Image attribution
+
+The following image files in this directory are taken from open sources:
+
+| File                  | Licence                                   | Attribution                                                                   |
+| --------------------- | ----------------------------------------- | ----------------------------------------------------------------------------- |
+| cook_female-32x32.png | Creative Commons Attribution 3.0 Unported | https://commons.wikimedia.org/wiki/File:Farm-Fresh_user_cook_female_white.png |
+| cook_male-32x32.png   | Creative Commons Attribution 3.0 Unported | https://commons.wikimedia.org/wiki/File:Farm-Fresh_user_cook_male_white.png   |
+| file-32x32.png        | Free for commercial use                   | https://www.iconfinder.com/icons/66768/file_info_icon                         |
+| file-128x128.png      | Free for commercial use                   | https://www.iconfinder.com/icons/66768/file_info_icon                         |

src/web/static/images/auto-fix.svg

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