♻️ refactor: Move most inline styles out of line

- Move out of line by using already defined css classes
- Move paddings out of line
- Move margins out of line
- Move z-indexes out of line
- Move center-relative-left out of line

layouts/partials/header/fixed-fill.html

@@ -1,5 +1,5 @@
 <div class="min-h-[148px]"></div>
-<div class="fixed inset-x-0 pl-[24px] pr-[24px] bg-neutral dark:bg-neutral-800" style="z-index:100">
+<div class="fixed inset-x-0 pl-[24px] pr-[24px] bg-neutral dark:bg-neutral-800 z-index-100">
   <div class="relative max-w-[64rem] ml-auto mr-auto">
     {{ partial "header/basic.html" . }}
   </div>