add subplebbit component

src/views/subplebbit/index.ts

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+export { default } from './subplebbit';

src/views/subplebbit/subplebbit.module.css

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+.debug {
+  position: fixed;
+  top: 0;
+  right: 0;
+  padding: 0.5em;
+}
+
+.debug select {
+  margin: 2px;
+}

src/views/subplebbit/subplebbit.tsx

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+import { useTranslation } from 'react-i18next';
+import useTheme from '../../hooks/use-theme';
+import styles from './subplebbit.module.css';
+
+// TODO: remove theme and languages selectors for debugging
+const ThemeSettings = () => {
+  const [theme, setTheme] = useTheme();
+
+  return (
+    <select value={theme} onChange={(e) => setTheme(e.target.value)}>
+      <option value='yotsuba'>Yotsuba</option>
+      <option value='yotsuba-b'>Yotsuba B</option>
+      <option value='futaba'>Futaba</option>
+      <option value='burichan'>Burichan</option>
+      <option value='tomorrow'>Tomorrow</option>
+      <option value='photon'>Photon</option>
+    </select>
+  );
+};
+
+// prettier-ignore
+const availableLanguages = ['ar', 'bn', 'cs', 'da', 'de', 'el', 'en', 'es', 'fa', 'fi', 'fil', 'fr', 'he', 'hi', 'hu', 'id', 'it', 'ja', 'ko', 'mr', 'nl', 'no', 'pl', 'pt', 'ro', 'ru', 'sq', 'sv', 'te', 'th', 'tr', 'uk', 'ur', 'vi', 'zh'];
+
+const LanguageSettings = () => {
+  const { i18n } = useTranslation();
+  const { changeLanguage, language } = i18n;
+
+  const onSelectLanguage = (e: React.ChangeEvent<HTMLSelectElement>) => {
+    changeLanguage(e.target.value);
+    window.location.reload();
+  };
+
+  return (
+    <div className={styles.languageSettings}>
+      <select value={language} onChange={onSelectLanguage}>
+        {availableLanguages.map((lang) => (
+          <option key={lang} value={lang}>
+            {lang}
+          </option>
+        ))}
+      </select>
+    </div>
+  );
+};
+
+const Subplebbit = () => {
+  return (
+    <div className={styles.content}>
+      <div className={styles.debug}>
+        <LanguageSettings />
+        <ThemeSettings />
+      </div>
+    </div>
+  );
+};
+
+export default Subplebbit;