refactor: Better handling of print CSS styles

[ianjon3s]

What does this PR do?

Prompted by the work by @jamdelion to add a print button.

I prototyped a few different approaches here (force background colours to remain, council name as pseudo content in place of logo), but have arrived at a solution that beats all others.

A previous print CSS update removed the large areas of solid header/footer background colour on print (particularly the black of the footer which could take up almost a whole page), and placed a small container with background colour behind the logos. As noted by @jessicamcinchak, removing background colours in print options rendered these invisible (white logo was still in place on white background).

Using filter: invert(1) on the images ensure they are still visible regardless of print settings for background graphics, and allows us to keep background colours out of the header + footer.

Open the print dialogue to see changes:

Example with SVG council logo:
https://3774.planx.pizza/buckinghamshire/report-a-high-hedge/preview

Example with PNG council logo:
https://3774.planx.pizza/birmingham/find-out-if-you-need-planning-permission/preview

[github-actions]

Removed vultr server and associated DNS entries

[jamdelion]

Nice! I've tested a few different team pages in the print dialogue and the logos all look good!

[jessicamcinchak]

Clever solution, thanks Ian!