General frontend tweaks (lazy load CTA images and styling updates)

[shyusu4]

Tickets:

• TWE-57
• TWE-60
• TWE-61
• TWE-46

Description of Changes Made

• On large screens a 'featured services' block with 4+ cards will now use a smaller heading to prevent text overflow
• Update the Torchbox Public-logo height
• Fix layout of the desktop submenu to match the design
• Lazy-load CTA images: footer CTA avatar and contact CTA avatar

How to Test

Navigate throughout your local build and view the relevant pages:
http://localhost:8000/wagtail/
http://localhost:8000/public-sector/

Screenshots

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MR Checklist

• Add a description of your pull request and instructions for the reviewer to verify your work.
• If your pull request is for a specific ticket, link to it in the description.
• Stay on point and keep it small so the merge request can be easily reviewed.
• Tests and linting passes.

Unit tests

• Added
• Not required

Documentation

• Updated build docs
• Updated editor guidelines (See https://intranet.torchbox.com/torchbox-com-project-docs for the private link, for Torchbox employees only)
• Updated field spec (See https://intranet.torchbox.com/torchbox-com-project-docs for the private link, for Torchbox employees only)
• Not required

Browser testing

• I have tested in the following browsers and environments (edit the list as required)
  • Latest version of Chrome on mac
  • Latest version of Firefox on mac
  • Latest version of Safari on mac
  • Safari on last two versions of iOS
  • Chrome on last two versions of Android
• Not required

Data protection

• Not relevant
• This adds new sources of PII and documents it and modifies Birdbath processors accordingly

Light and dark mode

• I have tested the changes in both light and dark mode
• The change is not relevant to dark and light mode

Accessibility

• Automated WCAG 2.1 tests pass
• HTML validation passes
• Manual WCAG 2.1 tests completed
• I have tested in a screen reader
• I have tested in high-contrast mode
• Any animations removed for prefers-reduced-motion
• Not required

Sustainability

• Images are optimised and lazy-loading used where appropriate
• SVGs have been optimised
• Performance and transfer of data considered
• If JavaScript is needed alternatives have been considered
• Not required

Pattern library

• The pattern library component for this template displays correctly, and does not break parent templates
• The styleguide is updated if relevant
• Changes are not relevant the pattern library

[helenb]

Thanks Sherry for looking at all these different tweaks. I've spotted a few things that need updating.

[helenb]

I haven't had a final test of the header styling for featured services, but I'm happy to approve as long as you have tested and it is behaving as expected. Nice work.