Upgrade Hugo to v0.152.2 and migrate site to Docsy Go module

[yankay]

What type of PR is this?

/kind cleanup

What this PR does / why we need it

Description

Due to the current Hugo and Docsy versions being too outdated for maintenance.
This PR upgrades the Hugo version for the documentation site to v0.152.2 and migrates the Docsy theme management to use Go modules. Reference: kubernetes-sigs/kueue#1884

Changes

• Makefile: Updated the hugo target to install v0.152.2 with extended tags. Added site-server target. Updated prepare-release-branch to modify hugo.toml.
• Netlify: Updated netlify.toml to use Hugo v0.152.2
• Site Config: Migrated site/config.toml to site/hugo.toml and initialized site/go.mod to manage github.com/google/docsy.
• Templates:
• Fixed feedback.html to correctly reference .Site.Params.ui.feedback.
• Simplified Google Analytics logic in head.html.

Which issue(s) this PR fixes

Fixes #

Special notes for your reviewer

Does this PR introduce a user-facing change?

Upgrade Hugo to v0.152.2 and migrate site to Docsy Go module

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[Copilot]

Pull request overview

This PR upgrades the Hugo documentation tooling from v0.92.0 to v0.152.2 and migrates from npm-based Docsy theme management to Hugo's Go module system, modernizing the documentation infrastructure.

Key changes:

• Hugo upgraded from v0.92.0 to v0.152.2 across all environments (Netlify and local development)
• Docsy theme migrated from npm to Go modules (v0.13.0)
• Configuration migrated from config.toml to hugo.toml with Hugo module imports

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Makefile	Updated hugo installation to v0.152.2 with extended tags, added site-server target, and updated prepare-release-branch to reference hugo.toml
netlify.toml	Updated Hugo version to v0.152.2 across all deployment contexts (production, deploy-preview, branch-deploy)
site/hugo.toml	Migrated from config.toml, removed npm theme configuration, added Go module imports for Docsy, and changed disableKinds from ["taxonomy", "taxonomyTerm"] to ["taxonomy"]
site/go.mod	Created new Go module file for site with Docsy v0.13.0 dependency
site/go.sum	Added checksums for Docsy v0.13.0 and its dependencies (Font-Awesome, Bootstrap)
site/layouts/partials/head.html	Simplified Google Analytics template logic to use single internal template
site/layouts/partials/feedback.html	Fixed template references to correctly access feedback configuration via .Site.Params.ui.feedback

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[Edwinhr716]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Edwinhr716, yankay

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