Add an 'About device' dialog for cellular
There is already a design for 'About device' dialog https://gitlab.gnome.org/Teams/Design/settings-mockups/blob/master/cellular/cellular-panel-adaptive.png
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There is already a design for 'About device' dialog https://gitlab.gnome.org/Teams/Design/settings-mockups/blob/master/cellular/cellular-panel-adaptive.png