feat: support tables in content and markdown embed

[TrySound]

Markdown embed now can convert tables like this into html

| Month    | Savings |
| -------- | ------- |
| January  | $250    |
| February | $80     |
| March    | $420    |

Both markdown embed and content embed have descendants to style tables. Added table, row, header and cell.

[TrySound]

Do we need to update default code in both components?

[johnsicili]

NICE

Yes I think we should have an example of every element.

| Header 1   | Header 2   | Header 3   |
|------------|------------|------------|
| Cell 1.1   | Cell 1.2   | Cell 1.3   |
| Cell 2.1   | Cell 2.2   | Cell 2.3   |
| Cell 3.1   | Cell 3.2   | Cell 3.3   |

<table>
  <tr>
    <th>Header 1</th>
    <th>Header 2</th>
    <th>Header 3</th>
  </tr>
  <tr>
    <td>Cell 1.1</td>
    <td>Cell 1.2</td>
    <td>Cell 1.3</td>
  </tr>
  <tr>
    <td>Cell 2.1</td>
    <td>Cell 2.2</td>
    <td>Cell 2.3</td>
  </tr>
  <tr>
    <td>Cell 3.1</td>
    <td>Cell 3.2</td>
    <td>Cell 3.3</td>
  </tr>
</table>