fix: update layout and import Chirpy template files

_includes/mode-toggle.html

@@ -0,0 +1,116 @@
+<!-- Switch the mode between dark and light. -->
+
+<script type="text/javascript">
+  class ModeToggle {
+    static get MODE_KEY() {
+      return 'mode';
+    }
+    static get MODE_ATTR() {
+      return 'data-mode';
+    }
+    static get DARK_MODE() {
+      return 'dark';
+    }
+    static get LIGHT_MODE() {
+      return 'light';
+    }
+    static get ID() {
+      return 'mode-toggle';
+    }
+
+    constructor() {
+      let self = this;
+
+      {%- comment -%} always follow the system prefers {%- endcomment -%}
+      this.sysDarkPrefers.addEventListener('change', () => {
+        if (self.hasMode) {
+          self.clearMode();
+        }
+        self.notify();
+      });
+
+      if (!this.hasMode) {
+        return;
+      }
+
+      if (this.isDarkMode) {
+        this.setDark();
+      } else {
+        this.setLight();
+      }
+    }
+
+    get sysDarkPrefers() {
+      return window.matchMedia('(prefers-color-scheme: dark)');
+    }
+
+    get isPreferDark() {
+      return this.sysDarkPrefers.matches;
+    }
+
+    get isDarkMode() {
+      return this.mode === ModeToggle.DARK_MODE;
+    }
+
+    get hasMode() {
+      return this.mode != null;
+    }
+
+    get mode() {
+      return sessionStorage.getItem(ModeToggle.MODE_KEY);
+    }
+
+    {%- comment -%} get the current mode on screen {%- endcomment -%}
+    get modeStatus() {
+      if (this.hasMode) {
+        return this.mode;
+      } else {
+        return this.isPreferDark ? ModeToggle.DARK_MODE : ModeToggle.LIGHT_MODE;
+      }
+    }
+
+    setDark() {
+      document.documentElement.setAttribute(ModeToggle.MODE_ATTR, ModeToggle.DARK_MODE);
+      sessionStorage.setItem(ModeToggle.MODE_KEY, ModeToggle.DARK_MODE);
+    }
+
+    setLight() {
+      document.documentElement.setAttribute(ModeToggle.MODE_ATTR, ModeToggle.LIGHT_MODE);
+      sessionStorage.setItem(ModeToggle.MODE_KEY, ModeToggle.LIGHT_MODE);
+    }
+
+    clearMode() {
+      document.documentElement.removeAttribute(ModeToggle.MODE_ATTR);
+      sessionStorage.removeItem(ModeToggle.MODE_KEY);
+    }
+
+    {%- comment -%}
+      Notify another plugins that the theme mode has changed
+    {%- endcomment -%}
+    notify() {
+      window.postMessage(
+        {
+          direction: ModeToggle.ID,
+          message: this.modeStatus
+        },
+        '*'
+      );
+    }
+
+    flipMode() {
+      if (this.hasMode) {
+        this.clearMode();
+      } else {
+        if (this.isPreferDark) {
+          this.setLight();
+        } else {
+          this.setDark();
+        }
+      }
+
+      this.notify();
+    }
+  }
+
+  const modeToggle = new ModeToggle();
+</script>