Validate baseURL

[slorber]

🐛 Bug Report

Using baseUrl without a trailing slash lead to site that does not really work.

Have you read the Contributing Guidelines on issues?

yes

To Reproduce

D2 website with baseUrl: '/build'

It builds but the site does not work once hosted (try to modify yarn serve:v2 script), due to expecting a trailing /

Expected behavior

Should work (normalized to a trailing /), or throw config validation error (requiring user to provide a trailing /)

Actual Behavior

Broken site

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@anshulrgoyal as it's related to the validation maybe you could do this later

[anshulrgoyal]

We can include it using regex in current pr next pr.

[anshulrgoyal]

I think validation error makes more sense since there might be some changes in the future and normalize would be done silently, which could result in bugs.

[slorber]

Yes agree, validation is fine. Normalization should rather be used only for "shortcuts", but we should expect users to provide a valid config and be strict about it.