chore: enforce a minimum required Hugo version.

[hugo-sid]

PR Description:

This PR enforces a minimum required Hugo version for the project. Specifically, it introduces a check to ensure that Hugo v0.123.0 or later is being used. If an earlier version is detected, the following error will be triggered:

WTFHugo requires Hugo v0.123.0 or later. Please upgrade Hugo to v0.123.0 or higher to use WTFHugo.

Summary:

• Added a version check using hugo.Version to ensure compatibility with Hugo v0.123.0 or later.
• Implemented an error message for users attempting to run the project using Hugo version < v0.123.0.

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Let me know if you need any changes!

[i40west]

Good idea. I really should have thought of that when I made the breaking change. Thanks.