Replace deprecated .Hugo with hugo.

[tobinjt]

Prerequisites

Put an x into the box(es) that apply:

• This pull request fixes a bug.
• This pull request adds a feature.
• This pull request introduces breaking change.
  Potentially, I don't know for sure.

Description

Hugo 0.55 deprecates .Hugo and produces this warning:

Page's .Hugo is deprecated and will be removed in a future release. Use the global hugo function.

Update the theme to use hugo rather than .Hugo.

I marked this as potentially introducing a breaking change because I don't know how backwards compatible this change is.

[tobinjt]

I don't understand why the tests are failing :(
The only error message I can see is 11:34:23 AM: failed during stage 'building site': Build script returned non-zero exit code: 255
Is there a doc I can read about how to run the tests myself to debug them?

Thanks,

[luizdepra]

I think the problem is the Hugo version used to build the deploy preview. You can change it in the netlify.toml file.
Also, you need do change the minimal hugo version in the theme.toml file.

[tobinjt]

Thanks for the info!
I've updated the minimum version and the version to test with to 0.54 after brute-force searching to find the minimum version supporting the new variable.
You might not want to accept this PR - it significantly increases the minimum required version.

There's another deprecation warning:
Page's .URL is deprecated and will be removed in a future release. Use .Permalink or .RelPermalink. If what you want is the front matter URL value, use .Params.url.
Sadly Hugo doesn't report where it's used, and I don't understand the intent of the theme well enough to make the change :(

[luizdepra]

There is no problem if we need to bump the minimal version of this theme. It is good to keep things up-to-date.

Thank you for the PR and for pointing the deprecation warning. I will create a Issue to remember to fix this problem later.