feat: QoL fixes, fix: CI url override

[QEDK]

• bumps GH action versions
• adds a config file during CI to store deployment URL (this was causing citation URLs to render incorrectly although the links were correct)
• adds current deployment URL to Jekyll config
• preloads Prism JS scripts
• prefetches MIPs as needed

[Copilot]

Pull request overview

This PR improves the MIPs Jekyll site’s deployment correctness and perceived performance, primarily by ensuring the correct canonical site URL is available during CI builds and by optimizing client-side loading/navigation behavior.

Changes:

• Updates the GitHub Pages workflow to generate an _config.deploy.yml during CI and build with a merged config.
• Sets url / baseurl in Jekyll config for the GitHub Pages deployment target.
• Updates the default layout to preload Prism assets and adds hover-based prefetching for internal links.

Reviewed changes

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

File	Description
.github/workflows/deploy-pages.yml	Bumps action versions and writes a deployment URL config used during the Jekyll build.
_layouts/default.html	Adds Prism preloads and introduces link-hover prefetching logic.
_config.yml	Sets the production url and baseurl defaults for the GitHub Pages site.

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