[v2] Linking between blog markdown files does not handle the date correct in URL

[da-kami]

🐛 Bug Report

When linking to another .md file within the blog, the URL is not correctly constructed.

Have you read the Contributing Guidelines on issues?

Yes.

To Reproduce

Assuming that blog was already configured:

1. Create file 2020-02-24-some-file.md in /blog folder
2. Create file 2020-02-23-some-other-file.md in /blog folder
3. Link 2020-02-23-some-other-file.md in 2020-02-24-some-file.md like this [link to other file](2020-02-23-some-other-file.md)
4. Startup the blog
5. The link wrongly points to: http://localhost:3000/blog/2020/02/24/2020-02-23-some-other-file.md

Expected behavior

The link should point to: http://localhost:3000/blog/2020/02/23/some-other-file.md

Actual Behavior

The link wrongly points to: http://localhost:3000/blog/2020/02/24/2020-02-23-some-other-file.md

Reproducible Demo

Concrete demo of the problem:

Example blog post:
https://deploy-preview-21--comit-network.netlify.com/blog/2019/07/11/a-closer-look-on-bitcoin

If you try to click on the link behind original blog post which links to a different blog post (like this in code: [original blog post](2018-06-23-connect-all-the-blockchains.md)) then it points to:

http://localhost:3000/blog/2019/07/11/2018-06-23-connect-all-the-blockchains.md

Screen shot: