What problem does this feature solve?

a lot of bugs to solve in medium-zoom usage

What does the proposed API look like?

1. remove @rspress/plugin-medium-zoom

2. should refactor it to Img in getCustomMDXComponent

Related reference info:

• rspress/packages/theme-default/src/layout/DocLayout/docComponents/img.tsx

  Line 5 in ad5fac9

  return <img {...props} src={normalizeImagePath(props.src || '')} />;

• Good design in fumadocs: https://github.com/fuma-nama/fumadocs/blob/5723bbe58ef805a5421a780abf235a10b251be2f/packages/ui/src/components/image-zoom.tsx#L6