fix: heading sizes in toc

Author: deemp

docs/theme/pagetoc.css

@@ -64,11 +64,11 @@ a[class^="pagetoc-H"]:only-child {
         color: var(--sidebar-fg);
     }
     .pagetoc .pagetoc-H1 {
-        font-size: 170%;
+        font-size: 150%;
         padding-left: 20px;
     }
     .pagetoc .pagetoc-H2 {
-        font-size: 140%;
+        font-size: 130%;
         padding-left: 20px;
     }
     .pagetoc .pagetoc-H3 {