Auto Compress Images

[github-actions[bot]]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 35.7%, saving 364.24 KB.

Filename	Before	After	Improvement
doc/res/header.png	418.17 KB	297.70 KB	-28.8%
doc/res/installation_connection.png	95.73 KB	49.65 KB	-48.1%
doc/res/installation_selection.png	114.75 KB	61.96 KB	-46.0%
doc/res/PACKAGE_ICON_ORIG.jpg	23.55 KB	11.12 KB	-52.8%
doc/res/smb_symlink.png	368.02 KB	235.53 KB	-36.0%