docs: update logo and notices

[fzipi]

what

• add fix for logo in newer versions of theme
• update notice and add icons
• add sandbox policy, mostly to point people that is sending mails to security@coreruleset.org with findings

why

• fixes
• point people to the policy

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[Copilot]

Pull request overview

This PR updates documentation styling by migrating to a newer version of the Hugo Relearn theme and standardizing notice shortcodes. The changes fix logo display issues in the new theme and add a comprehensive security policy for the CRS Sandbox.

Changes:

• Updated Hugo Relearn theme submodule and replaced custom logo partial with theme configuration
• Migrated all notice shortcodes to new syntax with icon support
• Added comprehensive CRS Sandbox Security Policy document
• Updated CRS Sandbox documentation with privacy notices and revised version information

Reviewed changes

Copilot reviewed 23 out of 24 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
themes/hugo-relearn	Updated theme submodule to newer version
layouts/partials/logo.html	Removed custom logo partial (now handled by theme)
layouts/partials/custom-header.html	Added CSS to configure logo width
content/_index.md	Updated notice syntax with icon
content/8-additional-resources/_index.md	Updated notice syntax with icon
content/7-known-issues/_index.md	Restructured content and updated notice syntax
content/6-development/6-7-crs-sandbox-security-policy.md	Added new security policy document
content/6-development/6-4-using-the-crs-sandbox.md	Added privacy notice and updated version references
content/6-development/6-2-crs-toolchain.md	Updated notice syntax with icons
content/5-advanced-topics/5-3-kubernetes-ingress-controller.md	Updated notice syntax with icon
content/5-advanced-topics/5-1-self-contained-mode.md	Updated notice syntax with icon
content/4-about-plugins/4-1-plugins.md	Updated notice syntax with icons
content/3-about-rules/ruleid.md	Updated notice syntax with icon
content/3-about-rules/metadata.md	Updated notice syntax with icon
content/3-about-rules/creating.md	Updated notice syntax with icon
content/2-how-crs-works/2-4-sampling_mode.md	Updated notice syntax with icon
content/2-how-crs-works/2-3-false-positives-and-tuning.md	Updated notice syntax with icons
content/2-how-crs-works/2-2-paranoia_levels.md	Updated notice syntax with icon
content/2-how-crs-works/2-1-anomaly_scoring/index.md	Updated notice syntax with icons
content/1-getting-started/1-4-engine_integration_options.md	Updated notice syntax with icons
content/1-getting-started/1-2-extended_install.md	Updated notice syntax with icons
content/1-getting-started/1-1-crs-installation.md	Updated notice syntax with icons
config/_default/config.toml	Added logo configuration parameters

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