Hugo relURL fix for CSS and JS paths

[chalin]

• Contributes to Broken URLs since Hugo 101 due to leading slash and relURL #1114, and hopefully fixes it
• Addresses CSS and JS path changes only -- though that might be the only thing that we need to address (but I'll confirm later)
• According to a very reliable source (@dep), the fix consists of the following -- excerpt from relURL is stripping the baseURL path gohugoio/hugo#10049 (comment) (emphasis mine):

  The gist of it is, res starting with a / is considered relative to the server host, remove that and it will work.

/cc @Marzal @daniel-milchev @deining

[chalin]

No changes to the generated UG files, and it fixes one of the Docsy-based projects -- as reported via eclipse-kanto/kanto#57:

Note that the styling of the code blocks is working once again.

So I'll merge now and hopefully the Kanto project folks (like @daniel-milchev) can confirm the fix.

[Marzal]

Thanks for the quick fix.

I only have doubts about this one:
https://github.com/google/docsy/blob/main/layouts/404.html#L5
<p>Oops! This page doesn't exist. Try going back to our <a href="{{ "/" | relURL }}">home page</a>.</p>
Some other projects put "" in similar cases
toppers/hakoniwa@ccdd258#diff-42986cf40ad96f5b7ca39d9b71ba6a9f252656de24cfe82100892ff0f4400f90L4

[chalin]

Thanks for the reference and the feedback. I've moved your comment into the issue -- #1114 (comment) -- since the issue is still open (I left it open because I knew that there might be more issues to address, like the ones that you're pointing out).

[daniel-milchev]

Thank you for the quick fix!
The problem with the code snippets has been resolved.