Escape { in user supplied html

[mishig25]

Problem

When there { is within a user supplied html string, it was causing svelte compiler error since { is a reserved character.

Solution

Escape { with {

Description of steps:

1. When there a html string inside mdsvex files, marked AST parses the outer most tag without without further parsing. For example, <div><p>test</p></div> will be parsed as single node without children. AST playground
2. Therefore, when there is a html node, parse it further with cheerio and replace { with { within texts
3. Problem solved

Should fix https://github.com/xenova/transformers.js/actions/runs/6300637437/job/17103917897?pr=320

todos:

• failing on course https://github.com/huggingface/course/actions/runs/6310776836/job/17133417160?pr=620
• check docstring style issue