Added html table support using Remark-GFM

HTML Tables aren't supported by Remark right out of the box, but there's a plugin that uses the Github approach (GFM).

A good tutorial on how to use it can be found here: How to support tables in remark

My unified call ended up looking like this:

import html from 'rehype-stringify'
import remarkGfm from 'remark-gfm'
import remarkParse from 'remark-parse'
import remark2rehype from 'remark-rehype'
import { unified } from 'unified'

  const processedContent = await unified()
    .use(remarkParse)
    .use(remarkGfm)
    .use(remark2rehype)
    .use(highlight)
    .use(html)
    .process(matterResult.content)