[BUG] Table header are rendered as td instead of th

[basile-parent]

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• [x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• [x] I have read the documentation and cannot find an answer.

Describe the bug When creating a table, the first line should be the table header section (which is correctly rendered in the markdown mode) :

| Some | table | headers |
| ---- | ----- | ------- |
| Some | table | content |

The documentation says the table plugin enable usage of GFM markdown tables which clearly explain the column headers should be rendered in table > thead > th but they are rendered in table > tbody > td

The bug concerns the table rendering inside MDXEditor, not the markdown generated (which is correct)

Reproduction I've set a reproduction in this codesandbox but you can basically reproduce it by creating a table and looking on the devtools.

To Reproduce Steps to reproduce the behavior:

1. Create a table on the rich text mode
2. Open the DevTools (F12 or Ctrl + I)
3. Inspect the generated table inside the MDXEditor

Expected behavior The table should be correctly implemented with thead and th

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Browser : Chrome / Brave / Firefox / Edge
• react: 18.2.0
• mdxeditor: 2.20.0
• typescript: 4.4.4

[petyosi]

That would be a good improvement indeed. Happy to accept a PR on the matter, this is the relevant node.