fix: AnkiDroid compatibility with class instead of ID

animation.js

 import HanziWriter from "hanzi-writer"
 
-const kanji = document.getElementById("kanji").innerText
-
-const hanziWriterContainer = document.getElementById("kanji-animation")
-
-HanziWriter.create(hanziWriterContainer, kanji).animateCharacter()
+for (const kanjiContainer of document.getElementsByClassName("kanji")) {
+  const kanjiText = kanjiContainer.textContent
+  const hanziWriterContainer = document.createElement("div")
+  kanjiContainer.append(hanziWriterContainer)
+  HanziWriter.create(hanziWriterContainer, kanjiText).animateCharacter()
+}