publicUrl doesn't behave as expected.

[Morgul]

• I confirm that this is an issue rather than a question.

Bug report

Setting build.publicUrl seems to correctly change the expected path for importing out of _saber, but the generated site still thinks that 'home' is / not /publicURL/.

I'm attempting to use saber to generate internal documentation on a self-hosted gitlab instance, using GitlabPages. Our pages urls are in the form of https://group-name.pages.git.example.com/project-name/. Setting publicUrl to /project-name/, while the site technically works, means that going to the index page takes me to the 404, and I have to hit 'back to home' to get the index, which has changed the url to be https://group-name.git.example.com/.

Version

v0.6.7

Steps to reproduce

You can see an illustration of this here:
https://morgul.gitlab.io/saber-publicurl-bug/

All that was required to reproduce it, however was:

1. Start a basic saber project.
2. Set publicUrl
3. Serve on a location other than /

Note: When I didn't have a theme set, I got a weird combination of the 404 page with some of the index page's content mixed in. Setting a theme just gets me just the normal 404 page.

What is expected?

I would expect to see the site.

What is actually happening?

I get the 404 page, and the 'Back' button takes me to the site correctly, but the URL is wrong, and refreshing the page, of course, generates a 404.

Other relevant information

• Result of running saber -v:
  • saber/0.6.7 darwin-x64 node-v12.4.0
• Browser version (optional):
  • Chrome Version 74.0.3729.169 (Official Build) (64-bit)
• Is Saber a global or local install?
  • local
• Which package manager did you use for the install?
  • yarn
• Does this issue occur when all plugins are disabled?
  • yes

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