feat: copy plugin link and plugin card style

[northword]

• copy plugin card's link
• refactor plugin card: move title link to footer button
• refactor plugin's download modal

[github-actions[bot]]

✅ 成功部署预览！

类型	链接
预览地址	https://deploy-preview-99--zotero-zh.netlify.app
最新提交	a8e8a313ded3ca567cfe1f2bfbb9f081e4d69ea3
部署日志	部署预览 #187