Fix heading styling

Thesis/Bibliography.typ

@@ -43,7 +43,7 @@
 #let render-bib() = {
   load-bibliography("Bibliography.bib", prefix: "cite:", full: true, style: "ieee")
 
-  heading(level: 1)[Spis literatury]
+  heading(level: 1, outlined: false)[Spis literatury]
   v(1em)
 
   context {
@@ -180,7 +180,7 @@
 
       let render-group(title, keys, start-idx) = {
         if keys.len() > 0 [
-          == #title
+          #heading(level: 2, title, outlined: false)
           #grid(
             columns: (auto, 1fr),
             column-gutter: 0.65em,
@@ -191,7 +191,6 @@
                 let entry = get-entry(k)
                 if entry == none { return () }
                 let num = start-idx + i + 1
-                // Pamiętaj: musisz użyć format-custom, który wkleiłeś wyżej!
                 ([\[#num\]], [#format-custom(entry)#label("cite:" + k)])
               })
               .flatten()