[Bug Report] Using relative paths in markdown files will generate 404 links after build

[kenberkeley]

Describe the bug

A bit similar to vuejs/vuepress#1227

As title.

Steps To Reproduce

This blog article page is generated by this markdown file (raw file here).

If you just click all the links on the page directly, everything works fine.
However, if you right click, Copy Link Address and then paste it to a new tab address bar, press the Enter key, finally it will end up with 404 Not Found.

Let's take the first link 前言 as an example.
Copy Link Address, we will have https://kenberkeley.github.io/_posts/my-it-job-hunting-experience-in-australia/0-preface/ , which SPA mode can handle properly whilst direct visits will always fail.

Expected behavior

Should generate https://kenberkeley.github.io/posts/my-it-job-hunting-experience-in-australia/preface/ for the 前言 link, instead of the improper link with /_posts/ and the actual filename 0-preface.
The permalink defined in 前言 page is /posts/my-it-job-hunting-experience-in-australia/preface

Environment (please complete the following information):

• Theme Version: v1.5.0
• Vuepress Version: v1.1.0
• OS: All
• Browser: All

[kenberkeley]

By the way, the meta 上|下一篇 links are correct.

[meteorlxy]

Seems that it's a common issue of VuePress permalink.

It would be better if you could create issue/PR in vuepress repo 😄

[meteorlxy]

This issue can be handled with vuepress-plugin-redirect.

Fixed in v1.5.1