message: fix(theme): fix darkmode apply in template
diff: <meta name="generator" content="VuePress {{ version }}" />
  <style>
  :root {
  - --c-bg: #fff;
  + --bg-color: #fff;
  }
  - html.dark {
  - --c-bg: #22272e;
  +
  + body[data-theme="dark"] {
  + --bg-color: #1e1e1e;
  }
  +
  html,
  body {
  - background-color: var(--c-bg);
  + background-color: var(--bg-color);
  }
  </style>
  <script>
  - const userMode = localStorage.getItem("vuepress-color-scheme");
  + const userMode = localStorage.getItem("vuepress-theme-hope-scheme");
  const systemDarkMode =
  window.matchMedia &&
  window.matchMedia("(prefers-color-scheme: dark)").matches;
  +
  if (userMode === "dark" || (userMode !== "light" && systemDarkMode)) {
  - document.documentElement.classList.toggle("dark", true);
  + document.body.setAttribute("data-theme", "dark");
  }
  </script>
  <!--vuepress-ssr-head-->
  