feat: add font input for coverletter

lib.typ

@@ -482,6 +482,7 @@
   date: datetime.today().display("[month repr:long] [day], [year]"),
   accent-color: default-accent-color,
   language: "en",
+  font: ("Source Sans Pro", "Source Sans 3"),
   body,
 ) = {
   if type(accent-color) == "string" {
@@ -497,7 +498,7 @@
   )
   
   set text(
-    font: ("Source Sans Pro", "Source Sans 3"),
+    font: font,
     lang: language,
     size: 11pt,
     fill: color-darkgray,

template/coverletter.typ

@@ -17,6 +17,7 @@
   ),
   profile-picture: image("./profile.png"),
   language: "en",
+  font: "Times New Roman"
 )
 
 #hiring-entity-info(entity-info: (