Review/ harmonise width of body text for all content types

[willguv]

Because of the incremental nature of LGD development, body text widths aren't consistent across all content types

We need to:

• review all types
• decide on best body text width(s)
• implement the changes

[willguv]

In Guide Overview and Guide Pages, the text is much wider than on Service Pages.

Looks like the node__restricted-width-section class isn't applied in node--localgov-guides-overview--full.html.twig and node--localgov-guides-page--full.html.twig

This can make it hard to read wider content on pages, e.g. in our example below:

Originally posted by @keelanfh in Jan 2023 https://github.com/localgovdrupal/localgov_base/issues/360