Update sidebar font sizes and weight

Author: Archmonger

docs/src/assets/css/sidebar.css

@@ -1,6 +1,6 @@
 :root {
-    --sizebar-font-size: 0.62rem;
-    --sizebar-font-size-2: 0.56rem;
+    --sizebar-font-size: 0.8rem;
+    --sizebar-font-size-2: 0.62rem;
 }
 
 .md-nav__link {
@@ -72,7 +72,7 @@
         padding: 0.5rem 0.5rem 0.5rem 1rem;
         margin: 0;
         border-radius: 0 10px 10px 0;
-        font-weight: 500;
+        font-weight: 600;
         overflow: hidden;
         font-size: var(--sizebar-font-size);
     }