Sitemaps should expose all links for each site

[StephDriver]

User stories As a user of the sitemaps, I can browse all publicly available pages from the sitemap of a Janeway site (journal/press/preprints) as if I was using the standard navigation from the front-end theme.

context

WCAG 2.4.5 - Multiple Ways

More than one way is available to locate a Web page within a set of Web pages except where the Web Page is the result of, or a step in, a process.

Our themes have a navigation menu, but that is just one way. Some journals have a sitemap, but not all, and as described in https://github.com/BirkbeckCTP/hourglass/issues/247 sitemaps must include the static pages as well as the articles. Journals have a search bar, but this only searches articles, and not the static pages or news items (e.g. typing in 'submission' doesn't bring up the submission page ).

Consider:

• [x] improved sitemaps
• [x] improved search
• [x] breadcrumbs