v0.5.0

• Add unplugin
• Move solid-marked to solid-marked/compiler
• Add MDXProvider and useMDX in solid-marked
• Make useMDX import source optional
• Set solid-marked as default import source
• Add support for yaml
• Add support for toml
• Add support for frontmatter
• Add support for Table Of Contents generation
• Add slugged ids for <Heading>
• Add isHead property to <TableRow>
• Fix source maps
• Fix JS expression compilation