fix: add some left margin to the toc (#377)

Before:
<img width="342" alt="Screenshot 2025-04-29 at 08 49 48"
src="https://github.com/user-attachments/assets/c50a7007-cbb3-4b6a-a2ce-a062fe945c3c"
/>

After:
<img width="376" alt="Screenshot 2025-04-29 at 08 49 10"
src="https://github.com/user-attachments/assets/83b92379-7d8e-4b16-a103-e1396cdee82b"
/>

## Summary by Sourcery

Bug Fixes:
- Add left padding to the main container within the Table of Contents
(`#nd-toc > div`) to indent its content.

Author: janb87

src/app/global.css

@@ -255,7 +255,6 @@
   );
 }
 
-
 th {
   @apply bg-fd-secondary;
 }
@@ -296,7 +295,6 @@ th {
   color: var(--color-fd-foreground);
 }
 
-
 [data-card2="true"] {
   @apply border-0;
   background: transparent
@@ -326,8 +324,6 @@ th {
     0 8px 20px rgba(100, 100, 255, 0.3);
 }
 
-
-
 [data-card3="true"] {
   @apply border-0;
   background: transparent
@@ -357,8 +353,6 @@ th {
     0 8px 20px rgba(0, 150, 100, 0.3);
 }
 
-
-
 #nd-docs-layout {
   background-color: var(--color-fd-sidebar);
 }
@@ -397,6 +391,10 @@ th {
   background-color: var(--sidebar-background);
 }
 
+#nd-toc > div {
+  padding-left: calc(var(--spacing) * 4);
+}
+
 button[data-search-full] {
   @apply min-w-[250px];
 }