feat: 添加新的 Sakai Vue 布局和样式，重构基础样式，更新 README，调整插件配置

src/layouts/sakai-vue/styles/_typography.scss

@@ -0,0 +1,68 @@
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin: 1.5rem 0 1rem 0;
+  font-family: inherit;
+  font-weight: 700;
+  line-height: 1.5;
+  color: var(--text-color);
+
+  &:first-child {
+    margin-top: 0;
+  }
+}
+
+h1 {
+  font-size: 2.5rem;
+}
+
+h2 {
+  font-size: 2rem;
+}
+
+h3 {
+  font-size: 1.75rem;
+}
+
+h4 {
+  font-size: 1.5rem;
+}
+
+h5 {
+  font-size: 1.25rem;
+}
+
+h6 {
+  font-size: 1rem;
+}
+
+mark {
+  background: #fff8e1;
+  padding: 0.25rem 0.4rem;
+  border-radius: var(--content-border-radius);
+  font-family: monospace;
+}
+
+blockquote {
+  margin: 1rem 0;
+  padding: 0 2rem;
+  border-left: 4px solid #90a4ae;
+}
+
+hr {
+  border-top: solid var(--surface-border);
+  border-width: 1px 0 0 0;
+  margin: 1rem 0;
+}
+
+p {
+  margin: 0 0 1rem 0;
+  line-height: 1.5;
+
+  &:last-child {
+    margin-bottom: 0;
+  }
+}