refactor(setup): reorder HTMLTextSplitter tag list

- Move `ul` and `ol` earlier in the allowed tags array.
- Remove duplicate and unused tags (`h5`, `h6`, `li`, redundant `ul`/`ol`).

setup/ingest.ts

@@ -24,17 +24,14 @@ const htmlSplitter = new HTMLTextSplitter({
     "emu-note",
     "emu-example",
     "emu-table",
+    "ul",
+    "ol",
     "td",
     "h3",
     "h4",
-    "h5",
-    "h6",
     "p",
     "div",
     "br",
-    "li",
-    "ul",
-    "ol",
   ],
   neverBreakWithin: ["emu-grammar", "emu-alg"],
 });