keyboard, fix clue bugs, length slider

src/util.ts

@@ -1,4 +1,6 @@
-export const wordLength = 5;
+import dictionary from "./dictionary.json";
+
+export const dictionarySet: Set<string> = new Set(dictionary);
 
 export function pick<T>(array: Array<T>): T {
   return array[Math.floor(array.length * Math.random())];