feat: parse the file link to route in markdown

[ppbl]

🤔 这个变动的性质是？/ What is the nature of this change?

• [x] 新特性提交 / New feature
• [ ] bug 修复 / Fix bug
• [ ] 样式优化 / Style optimization
• [ ] 代码风格优化 / Code style optimization
• [ ] 性能优化 / Performance optimization
• [ ] 构建优化 / Build optimization
• [ ] 网站、文档、Demo 改进 / Website, documentation, demo improvements
• [ ] 重构代码或样式 / Refactor code or style
• [ ] 测试相关 / Test related
• [ ] 其他 / Other

🔗 相关 Issue / Related Issue

close #238

💡 需求背景和解决方案 / Background or solution

解析 md 文件 link 的时候，通过目标 md 路径提取文件信息，根据 FrontMatter 及项目相关配置生成最终路由，替换链接。

相比之前的一些改动：

现在，只有在项目构建之后有对应路由的情况下，才会对链接进行替换 也就是说，只有 md 文件中引入的路径在 opts.resolve.includes 里面且没有被排除掉，并且目标路径文件存在的情况下。

之前像这样无效的链接， [不在文档路径或文件不存在](../outer.md) , 仅仅删除 .md 后缀没有意义，现在不做处理

📝 更新日志 / Changelog

Language	Changelog
🇺🇸 English	suport parse the file link to route in markdown
🇨🇳 Chinese	支持解析 markdown 中的文件链接到路由

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[PeachScript]

/rebase

[codecov[bot]]

Codecov Report

Merging #852 (aca1e44) into master (57d4133) will increase coverage by 0.10%. The diff coverage is 100.00%.

:exclamation: Current head aca1e44 differs from pull request most recent head ab08667. Consider uploading reports for the commit ab08667 to get more accurate results

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
+ Coverage   94.61%   94.71%   +0.10%     
==========================================
  Files         112      113       +1     
  Lines        2581     2613      +32     
  Branches      826      835       +9     
==========================================
+ Hits         2442     2475      +33     
+ Misses        135      134       -1     
  Partials        4        4              

Impacted Files	Coverage Δ
...es/preset-dumi/src/routes/getRouteConfigFromDir.ts	96.87% <100.00%> (+1.87%)	:arrow_up:
...s/preset-dumi/src/routes/getRouteConfigFromFile.ts	100.00% <100.00%> (ø)
...ackages/preset-dumi/src/transformer/remark/link.ts	92.85% <100.00%> (+1.55%)	:arrow_up:

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[ppbl]

突然发现 getRouteConfigFromFile 是否可以和 getRouteConfigFromDir 的 https://github.com/umijs/dumi/blob/master/packages/preset-dumi/src/routes/getRouteConfigFromDir.ts#L103 这部分共用一个逻辑, 多的只是需要单独判断文件路径~

[PeachScript]

突然发现 getRouteConfigFromFile 是否可以和 getRouteConfigFromDir 的 https://github.com/umijs/dumi/blob/master/packages/preset-dumi/src/routes/getRouteConfigFromDir.ts#L103 这部分共用一个逻辑, 多的只是需要单独判断文件路径~

可以试试，目前看重复逻辑确实有点多

[ppbl]

/rebase

[PeachScript]

❤️ 感谢贡献，dumi v1 不再更新，PR 将会关闭；dumi v2 已发布，欢迎继续参与 dumi 的建设，https://d.umijs.org/