optional shiki and mermaid

• shiki mermaid config by @yuguaa in #39

完善组件内容

#32 #31

feat: codeblock header sticky

What's Changed

• fix: 修复useMermaidZoom滚动bug by @hy-lmh in #26
• feat: 支持代码块头部sticky定位 by @YangMingze99 in #24
• Feat/sticky code header by @yuguaa in #29

New Contributors

• @YangMingze99 made their first contribution in #24

Full Changelog: v0.0.1-beta.103...v0.0.1-beta.105