docs(swissquote): use image captions and lazy-loading

[HonkingGoose]

Changes

• Use the new image captions
• Mark the images for lazy loading
• Make sure the XKCD link opens in a new tab by using target=_blank

Context

The "flavor text" for the image is now centered below the image. As you can see the HTML to create a image caption is a bit tricky. 😄

I'm marking this PR as draft, because we need this PR to be reviewed, and merged first:

• chore: enable image captions and lazy loading renovatebot.github.io#215

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 32.167.0 🎉

The release is available on:

• GitHub release
• 32.167.0

Your semantic-release bot 📦🚀