feat: add prek as precommit

[sandert-k8s]

Add prek as precommit.

• Linting

When pushing, it also checks:

• Lychee link checker
• If reference.md is up to date

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[Copilot]

Pull request overview

This PR introduces prek-based local hooks to mirror parts of CI behavior (link checking and API reference freshness checks), and updates documentation content to satisfy new linting/formatting constraints.

Changes:

• Add prek.toml with commit-stage content linting plus pre-push hooks for lychee and API docs freshness.
• Add helper scripts for lychee setup/cleanup and API docs regeneration + diff checking.
• Normalize whitespace/formatting across many Markdown docs and add missing Hugo _index.md front-matter for docs sections.

Reviewed changes

Copilot reviewed 18 out of 44 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/lychee.sh	Pre-push wrapper to mirror CI image handling before running lychee.
scripts/apidocs-check.sh	Pre-push script to regenerate API docs and fail when reference.md files differ.
prek.toml	Adds prek hook configuration (content linting on commit; lychee + apidocs check on push).
DEVELOPMENT.md	Documents installing/using prek hooks locally.
content/en/project/governance.md	Whitespace cleanup.
content/en/project/contributions/adoption.md	Whitespace cleanup.
content/en/project/contributions/addons.md	Whitespace cleanup.
content/en/project/commitment.md	Whitespace cleanup.
content/en/project/branding.md	Whitespace cleanup.
content/en/ecosystem/integrations/velero.md	Front-matter delimiter formatting cleanup.
content/en/ecosystem/integrations/rancher.md	Front-matter delimiter formatting cleanup.
content/en/ecosystem/integrations/openshift.md	Front-matter delimiter formatting cleanup.
content/en/ecosystem/integrations/opencost.md	Code block fence alignment cleanup.
content/en/ecosystem/integrations/eso.md	Removes trailing blank lines.
content/en/ecosystem/integrations/envoy-gateway.md	Removes trailing blank line.
content/en/ecosystem/integrations/dashboard.md	Removes trailing blank line.
content/en/ecosystem/integrations/argocd.md	Whitespace cleanup in embedded Lua/YAML snippet.
content/en/ecosystem/_index.md	Shortcode indentation/whitespace cleanup.
content/en/docs/whats-new.md	Updates Flux CD link target and whitespace normalization.
content/en/docs/tenants/rules.md	Whitespace cleanup in YAML examples.
content/en/docs/tenants/quickstart.md	Whitespace cleanup in examples.
content/en/docs/tenants/metadata.md	Whitespace cleanup in YAML example.
content/en/docs/tenants/enforcement.md	Whitespace cleanup in YAML example.
content/en/docs/tenants/_index.md	Whitespace cleanup.
content/en/docs/resource-management/customquotas/_index.md	Whitespace cleanup and code block fence alignment.
content/en/docs/resource-management/_index.md	Adds Hugo section front-matter for “Resource Management”.
content/en/docs/replications/tenant.md	Removes trailing blank lines.
content/en/docs/proxy/setup/installation.md	Removes trailing blank lines.
content/en/docs/proxy/gangplank.md	Code block fence alignment.
content/en/docs/overview/_index.md	Updates links to new Resource Management paths.
content/en/docs/operating/troubleshoting.md	Whitespace cleanup.
content/en/docs/operating/setup/rancher.md	Removes trailing blank line.
content/en/docs/operating/setup/_index.md	Front-matter delimiter formatting cleanup.
content/en/docs/operating/best-practices/networking.md	Whitespace cleanup in YAML example and trailing blank lines.
content/en/docs/operating/best-practices/images.md	Whitespace/indentation cleanup.
content/en/docs/operating/best-practices/_index.md	Removes trailing blank line.
content/en/docs/operating/architecture.md	Updates ResourcePools link to new Resource Management paths.
content/en/docs/operating/admission-policies.md	Removes trailing blank lines.
content/en/docs/operating/_index.md	Front-matter delimiter formatting cleanup.
content/en/docs/guides/namespace-migration-across-tenants.md	Removes trailing blank line.
content/en/docs/guides/_index.md	Whitespace cleanup.
content/en/docs/_index.md	Adds Hugo section front-matter for “Documentation”.
content/en/adopters/_index.md	Shortcode indentation/whitespace cleanup.
content/dictionary.txt	Whitespace cleanup.

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