feat: Use SVG for conditional reqs diagrams

[bsmth]

Description

This PR converts existing .png to use SVG format. The mermaid source are being added to shared assets in parallel.

Motivation

Reducing binary assets, maintenance of diagrams by adding source files.

How to review this PR

For convenience, it may be best to compare the preview URL generated here with the live page at https://developer.mozilla.org/en-US/docs/Web/HTTP/Conditional_requests#use_cases

Related issues and pull requests

• chore(CSS): Replace png images with SVG equivalents #30820
• feat: Add SVG diagrams for HTTP sequences #31812
• Discussion about SVG format for images: https://github.com/orgs/mdn/discussions/631

Shared assets

Source and generated files for these changes:

• feat: Add HTTP sequence diagrams for conditional requests shared-assets#11

[github-actions]

Preview URLs

• /en-US/docs/Web/HTTP/Conditional_requests

Flaws (11)

URL: /en-US/docs/Web/HTTP/Conditional_requests
Title: HTTP conditional requests
Flaw count: 11

• images:
  • External image URL
  • External image URL
  • External image URL
  • External image URL
  • External image URL
  • and 6 more flaws omitted

(comment last updated: 2024-06-13 13:00:03)

[pepelsbey]

Looks* good! Thank you :)

• god bless the header override option in Chrome DevTools :)

[bsmth]

Thank you! Going to merge, but would be nice if the dev env showed the images properly 😢