fixed table of contents sticking on all pages; more minor changes

src/lib/table-of-contents.svelte

@@ -1,6 +1,12 @@
 <script lang="ts">
     import {onMount} from 'svelte';
 
+    let {
+        disableStickyScrolling,
+    }: {
+        disableStickyScrolling?: boolean;
+    } = $props();
+
     let idCounter: number = 0;
 
     let container: HTMLElement;
@@ -46,9 +52,15 @@
     }
 </script>
 
+{#if disableStickyScrolling}
 <div class="toc-container notched">
     <ul class="toc-list" bind:this={container}></ul>
 </div>
+{:else}
+<div class="toc-container notched sticky-toc">
+    <ul class="toc-list" bind:this={container}></ul>
+</div>
+{/if}
 
 <style>
     :global {
@@ -59,6 +71,9 @@
 
             background-color: var(--color-background-highlight);
             padding: 16px 0;
+        }
+
+        .sticky-toc {
             position: sticky;
             top: 20px;
         }