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Add installation instructions for image optimization tools

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@@ -90,8 +90,8 @@
1. Update screenshot (which will update the screenshot on the website and in the README):
1. Create one screenshot for desktop and one for mobile version
1. Put those two screenshots into one image like *images/screenshot.png* and overwrite that by the new one
1. `optipng -o7 images/screenshot.png`
1. `advpng -z4 images/screenshot.png`
1. `optipng -o7 images/screenshot.png` (Installation on Debian-based systems: `sudo apt install optipng`)
1. `advpng -z4 images/screenshot.png` (Installation on Debian-based systems: `sudo apt install trimage`)
1. `git add images/screenshot.png`
1. `git commit -m "Update screenshot"`
1. `git push origin master`
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