1.0.0 release

This is the first initial release of GtkSignage.

It includes:

• Slides / Admin controls for creating/editing slides
• Basic CEC controls (untested)
• GTK Display
• Install/update scripts

Install this version specifically using:

bash <(curl -fsSL https://raw.githubusercontent.com/mgroves/GtkSignage/refs/tags/1.0.0/install.sh)