added doc for circuit, util and wire

src/util.typ

@@ -1,3 +1,4 @@
+/// Predefined color palette
 #let colors = (
   orange: rgb(245, 180, 147),
   yellow: rgb(250, 225, 127),
@@ -6,11 +7,24 @@
   purple: rgb(189, 151, 255)
 )
 
+/// Pads a string on the left with 0s to the given length
+///
+/// #example(`#util.lpad("0100", 8)`, mode: "markup")
+///
+/// - s (str): The string to pad
+/// - len (int): The target length
+/// -> str
 #let lpad(s, len) = {
   let res = "0" * len + s
   return res.slice(-len)
 }
 
+/// Returns the anchor on the opposite side of the given one
+///
+/// #example(`#util.opposite-anchor("west")`, mode: "markup")
+///
+/// - anchor (str): The input anchor
+/// -> str
 #let opposite-anchor(anchor) = {
   return (
     north: "south",
@@ -25,6 +39,11 @@
   ).at(anchor)
 }
 
+/// Returns the anchor rotated 90 degrees clockwise relative to the given one
+///
+/// #example(`#util.rotate-anchor("west")`, mode: "markup")
+/// - anchor (str): The anchor to rotate
+/// -> str
 #let rotate-anchor(anchor) = {
   return (
     north: "east",