Optimize typography

- Set the table width to 100% on small screens
- Optimize list style
- Optimize image style
- Make checkbox color lighter (light mode)
- Reduce the space for inline code

assets/css/_addon/syntax.scss

@@ -56,6 +56,7 @@ div > pre {
   @extend %code-snippet-radius;
 
   color: var(--highlighter-rouge-color);
+  margin-top: 0.5rem;
   margin-bottom: 1.2em; /* Override BS Inline-code style */
 }
 
@@ -111,7 +112,6 @@ code {
   &.highlighter-rouge {
     font-size: $code-font-size;
     padding: 3px 5px;
-    margin: 0 0.15rem;
     border-radius: 4px;
     background-color: var(--inline-code-bg);
   }