chore(deps): bump markdown-to-jsx and @storybook/addon-knobs

Removes [markdown-to-jsx](https://github.com/quantizor/markdown-to-jsx). It's no longer used after updating ancestor dependency [@storybook/addon-knobs](https://github.com/storybookjs/addon-knobs). These dependencies need to be updated together.


Removes `markdown-to-jsx`

Updates `@storybook/addon-knobs` from 5.3.21 to 8.0.1
- [Release notes](https://github.com/storybookjs/addon-knobs/releases)
- [Changelog](https://github.com/storybookjs/addon-knobs/blob/v8.0.1/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/addon-knobs/commits/v8.0.1)

---
updated-dependencies:
- dependency-name: markdown-to-jsx
  dependency-type: indirect
- dependency-name: "@storybook/addon-knobs"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>