The docs don't just have Slint language files. They have Rust, Cpp, Javascript, bash, etc. This change shows a little language hint to make it clear what the language is.
It fades away on hover to be replaced by the copy/paste or open in SlintPad icons.
Show hide 'run in slintpad' button with same logic as copy paste code button.
Move std-widgets into reference.
Stop using code styling for h3 headers.
Make better use of Astro to reduce runtime javascript.
Make better use of Astro to ensure UI is built at build time and isn't dynamic at runtime.
Fix very broken github link.
Move some items around and group std-widgets similar to element reference.
Move Timer to elements.
Use the simpler :::tip[Tip] markdown style.
Update Astro and the link validator.
