Update README.md

Adjusting the wording

README.md

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-CasaOS is an open-source home server system based on the Docker ecosystem and designed for home scenarios. It is committed to building the world's most simple, easy-to-use, and elegant home hub system.
+CasaOS is an open-source home server system based on the Docker ecosystem and designed for home scenarios. It is committed to building the world's most simple, easy-to-use, and elegant home server system.
 
 IceWhale team believes that through community-driven collaborative innovation and open communication with global developers, we can reshape the digital home experience like never before.