Add initial 11ty website structure

website/node_modules/is-alphanumerical/index.js

@@ -0,0 +1,13 @@
+import {isAlphabetical} from 'is-alphabetical'
+import {isDecimal} from 'is-decimal'
+
+/**
+ * Check if the given character code, or the character code at the first
+ * character, is alphanumerical.
+ *
+ * @param {string|number} character
+ * @returns {boolean} Whether `character` is alphanumerical.
+ */
+export function isAlphanumerical(character) {
+  return isAlphabetical(character) || isDecimal(character)
+}