fix(docker-training): apply design review findings

[elft3r]

$(cat <<'EOF'

Summary

• jochen.html: Added missing <section> wrapper (fixed in canonical source shared/sections/jochen.html)
• why-docker.html: Added .source attribution for docker-hub-stats.png; linked @benorama credit with <a> element
• cloud-native.html: Changed 7 Core Technologies icons from --r-link-color (gold) → --r-accent-color (green) for consistency with .icon-accent semantics
• container-history.html: Replaced inline-styled <div> blockquote with semantic <blockquote>, which also corrects the border colour from gold (--r-link-color) to green (--r-accent-color) via the theme rule
• docker-images.html: Replaced all 13 off-palette hex colours in the inline SVG diagram with CSS custom property references (--r-accent-color, --r-muted-color, --r-link-color, --r-card-border, --r-heading-color); added loading="lazy" to 3 images
• devops-docker.html: Added class="styled-list" to 2 bare <ul> elements inside .card
• docker-kubernetes.html: Linked @ajeetraina source credit; added loading="lazy" to 4 images
• docker-networking.html, docker-volumes.html, docker-swarm.html, serverless.html, docker-desktop.html, monitoring.html: Added loading="lazy" to late-deck images (13 images across 6 files)

Test plan

• Run npm run check-render -- docker-training — expect 0 overflow / 0 contrast failures (same as baseline)
• Visually verify the "Images & Layers" SVG slide renders with on-brand green/gold colours instead of the old teal/cyan
• Verify the "What are containers?" blockquote renders with the correct green left border and accent-light background
• Confirm Core Technologies icons match the green Key Characteristics icons
• Check that the jochen.html speaker slide renders correctly in all three presentations

https://claude.ai/code/session_01VVPnYcx8HkWWSqWK7EjFsJ
EOF
)

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Generated by Claude Code

[github-actions]

Preview Deployment

This PR has been deployed for preview:

Presentation	URL	Commit
cloud-migrations	https://0592770a.presentations-15u.pages.dev/cloud-migrations/	bd1fac3
docker-training	https://0592770a.presentations-15u.pages.dev/docker-training/	bd1fac3
secure-landing-zones	https://0592770a.presentations-15u.pages.dev/secure-landing-zones/	bd1fac3

Last updated: Thu, 04 Jun 2026 10:46:46 GMT

[Copilot]

Pull request overview

This PR applies design-review improvements across the docker-training presentation and shared speaker slide content, focusing on semantic HTML, consistent theme-driven styling, attribution hygiene, and image loading optimizations.

Changes:

• Standardized styling by aligning icon/SVG colors with the reveal theme’s CSS custom properties and semantics.
• Improved slide markup semantics and consistency (e.g., adding missing <section> wrapper, replacing a styled <div> quote with <blockquote>, adding styled-list in cards).
• Added/updated image attributions and applied loading="lazy" to a set of images to reduce upfront load cost.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
shared/sections/jochen.html	Wraps shared speaker slide content in a <section> for consistent external slide inclusion.
docker-training/sections/why-docker.html	Improves attribution formatting (linked credit) and adds a missing image source line.
docker-training/sections/serverless.html	Adds loading="lazy" to section images.
docker-training/sections/monitoring.html	Adds loading="lazy" to the monitoring image.
docker-training/sections/docker-volumes.html	Adds loading="lazy" to volume-related images.
docker-training/sections/docker-swarm.html	Adds loading="lazy" to swarm images.
docker-training/sections/docker-networking.html	Adds loading="lazy" to networking images.
docker-training/sections/docker-kubernetes.html	Adds loading="lazy" to images and links the credit handle as an external source.
docker-training/sections/docker-images.html	Migrates much of the inline SVG palette to CSS variables and adds lazy-loading to later images.
docker-training/sections/docker-desktop.html	Adds loading="lazy" to the architecture image.
docker-training/sections/devops-docker.html	Applies styled-list to lists inside .card for consistent rendering.
docker-training/sections/container-history.html	Replaces an inline-styled quote container with semantic <blockquote> to leverage theme styling.
docker-training/sections/cloud-native.html	Aligns “Core Technologies” icon color usage with --r-accent-color semantics.

Comments suppressed due to low confidence (1)

docker-training/sections/docker-images.html:95

• This SVG label still hard-codes the heading color (fill="#1a202c"). Using --r-heading-color keeps it consistent with the theme-driven styling used elsewhere in the diagram.

    <text x="342" y="187"
          font-family="Source Sans Pro,Helvetica,sans-serif"
          font-size="12" font-weight="600" fill="#1a202c">Image layers (R/O)</text>

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