Rename angle brackets and quotes to chevron

[Enivex]

Currently, we had two entirely different families of symbols under angle. Namely all the angle brackets, and the geometry kind. I've renamed the brackets to chevron, which is an alternate name for them that someone suggested. At the same time, I moved the remaining angles to the "Geometry" section.

For consistency, I also renamed quote.angle to quote.chevron.

[T0mstone]

I'm not a big fan of chevron. There's also already U+1FBCA 🯊 WHITE UP-POINTING CHEVRON in Unicode, which is something entirely different.

Thinking of other shapes with an obtuse angle, I came up with "roof", but it's not really a good name either (especially given that these roofs (rooves?) would be sideways)...

[Enivex]

I'm not a big fan of chevron. There's also already U+1FBCA 🯊 WHITE UP-POINTING CHEVRON in Unicode, which is something entirely different.

Well, I wouldn't say entirely different. In any case, that symbol is in the "legacy computing" block of unicode, and therefore highly specialized. I don't think there's any danger in creating conflicts here.

I didn't take it out of thin air by the way. They can literally be called chevrons.

See e.g https://en.wikipedia.org/wiki/Bracket#Angle_brackets and https://en.wiktionary.org/wiki/chevron (meaning 5.)

[MDLC01]

To make chevron callable, it would have to be added here:

https://github.com/typst/typst/blob/df89a0e85b80844ef56a6fa98af01eaaf7553da8/crates/typst-library/src/foundations/symbol.rs#L101-L126

[MDLC01]

With #86 merged, this can now use the dedicated deprecation syntax for variants.

[Enivex]

With #86 merged, this can now use the dedicated deprecation syntax for variants.

Done