Add note about unofficial packages in INSTALL.md
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		@@ -36,7 +36,9 @@ but compiling on Windows and macOS should be possible with the right tools.
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### Linux
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					### Linux
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For developement, or if none of the package options are satisfying, 
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					For developement, or if none of the package options are satisfying, 
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see [manual installation](#manual-installation).
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					see [manual installation](#manual-installation).  
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					Packages other than the AppImage and Flatpak are not maintained by the Mirage 
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					authors, and thus might be outdated.
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#### AppImage
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					#### AppImage
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