Fix Storybook build

[fredvisser]

Pull Request

🤨 Rationale

A combination of node 22.12.0 and our Storybook configuration fails. See nodejs/node#56127 for more information.

A quick fix is to remove some unnecessary code that the Storybook migration tools added to our configuration a few releases ago.

👩‍💻 Implementation

• Removed uses of the getAbsolutePath() macro
• Removed the @storybook/addon-mdx-gfm Storybook add-on which, per the build logs, isn't necessary to have installed to support GitHub flavored markdown

🧪 Testing

• Verified that markdown tables still render in Storybook (GFM feature)
• The build no longer breaks

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[rajsite]

Validated build worked with node 22.7.0 and failed with node 22.12.0 on main.
Validated changes here build with node 22.12.0.