Bezier-rs: Add a pivot point to the 'rotate' function (#792)

* Add function to rotate around a point

* Update svg

* Improve rotation line-to-center styling

* Add second angle of lines

Co-authored-by: Keavon Chambers <keavon@keavon.com>

website/other/bezier-rs-demos/wasm/src/svg_drawing.rs

@@ -8,6 +8,7 @@ pub const WHITE: &str = "white";
 pub const GRAY: &str = "gray";
 pub const RED: &str = "red";
 pub const ORANGE: &str = "orange";
+pub const PINK: &str = "pink";
 pub const GREEN: &str = "green";
 pub const NONE: &str = "none";