font: add license header

Also, add a comment that the .css/scss files are auto generated

LICENSE.md

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2019-2021 The Bootstrap Authors
+Copyright (c) 2019-2023 The Bootstrap Authors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

build/font/css.hbs

@@ -1,3 +1,11 @@
+/*!
+ * Bootstrap Icons (https://icons.getbootstrap.com/)
+ * Copyright 2019-2023 The Bootstrap Authors
+ * Licensed under MIT (https://github.com/twbs/icons/blob/main/LICENSE)
+ */
+
+/* THIS FILE IS AUTO-GENERATED, DO NOT EDIT MANUALLY */
+
 @font-face {
   font-display: block;
   font-family: "{{ name }}";

build/font/scss.hbs

@@ -1,3 +1,11 @@
+/*!
+ * Bootstrap Icons (https://icons.getbootstrap.com/)
+ * Copyright 2019-2023 The Bootstrap Authors
+ * Licensed under MIT (https://github.com/twbs/icons/blob/main/LICENSE)
+ */
+
+/* THIS FILE IS AUTO-GENERATED, DO NOT EDIT MANUALLY */
+
 ${{ name }}-font: "{{ name }}" !default;
 ${{ name }}-font-dir: "{{ fontsUrl }}" !default;
 ${{ name }}-font-file: #{${{ name }}-font-dir}/#{${{ name }}-font} !default;