Turn '#' and '##' headings into an indented bullet list.
Generate a Table of Contents from markdown.
For every line starting with `# ` print `- <title>`. For every line starting with `## ` print ` - <title>` (two spaces of indent). Ignore everything else.
Test input:
# Intro
some text
## Goals
## Setup
# Usage
## Run
Expected output:
- Intro
- Goals
- Setup
- Usage
- RunSign in to save your code and track progress across devices.
