Fix custom logos taking up full width

[AshGDS]

What / Why

• HTML publications have some custom organisation logo styles, which were modified in Style organisation logos with inline-block instead of flexbox #3308
• Examples: 1 / 2 / 3 / 4
• It looks like the student loans company logo has been uploaded at a large resolution, and the style change made previously did not account for situations where the custom image was this large.
• Therefore I have added a 240px max-width for images on desktop, and 140px width for images on mobile/tablet - to try and have a similar resizing behaviour as the logo before the bug was introduced (see archived page here)
• I thought it may be better to use the govuk media queries to resize here rather than a percentage width value like previous behaviour, so that the image size is more deterministic.

Visual Changes

Before (Desktop)

After (Desktop)

Before (Mobile/Tablet)

After (Mobile/Tablet)