Remove top bar above nav, add whitespace around section dividers

- Remove border-top from site header
- Add margin-top to h2 headings for breathing room
- Add 2em margin above and below hr elements

Bump site version to 1.0.3.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: deftio

docs/_config.yml

@@ -1,5 +1,5 @@
 title: TriePack
-version: "1.0.2"
+version: "1.0.3"
 description: Compressed trie-based dictionary format for fast, compact key-value storage
 theme: minima
 baseurl: "/triepack"

docs/assets/main.scss

@@ -47,11 +47,20 @@ $spacing-unit: 16px;
 h2 {
   border-bottom: 1px solid #e8e8e8;
   padding-bottom: 0.3em;
+  margin-top: 1.8em;
+}
+
+/* ── Horizontal rules ────────────────────────────────────────────────── */
+
+hr {
+  margin-top: 2em;
+  margin-bottom: 2em;
 }
 
 /* ── Navigation ──────────────────────────────────────────────────────── */
 
 .site-header {
+  border-top: none;
   border-bottom: 2px solid #424242;
 }