In-slide layout not working

[LexTran]

Describe the bug
Hi, I was using moffee to generate slides. Great work by the way.
So the question is I was creating a two column slides, yet it is not working following the document's instruction to use '<->'

To Reproduce
I try to simply copy the commands showed in README

Top bun
===
Patty on the left
<->
Lettuce on the right
===
Bottom bun

Expected behavior
It should show me a two column slide

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• Browser chrome
• Version 0.2.6