fixed font link for subpages; reduced width of devlog posts; reduced height of banner; removed old banner

src/lib/content.svelte

@@ -1,16 +1,37 @@
-<div class="main-content">
-    <slot />
-</div>
+<script lang="ts">
+    let {
+        useContentWidth,
+    }: {
+        useContentWidth?: boolean;
+    } = $props();
+</script>
+
+{#if useContentWidth}
+    <div class="main-content content-width">
+        <slot />
+    </div>
+{:else}
+    <div class="main-content page-width">
+        <slot />
+    </div>
+{/if}
 
 <style>
     .main-content {
         width: 100%;
-        max-width: var(--page-width);
         box-sizing: border-box;
         margin: 0 auto;
         padding: 0 24px;
     }
 
+    .content-width {
+        max-width: var(--content-width);
+    }
+
+    .page-width {
+        max-width: var(--page-width);
+    }
+
     @media screen and (max-width: 800px) {
         .main-content {
             padding: 0 8px;