Allow defining static page content using the content blocks

Currently the static page content is only defined by a single text field. There may be much more complex use cases for the static page contents such as showing a combination of hero image, content section, video, process listing, etc. on a single page. I suggest to make the content blocks feature applicable to the static pages as it is currently applied for the home page. This would allow a much more flexible way of defining the content for the static content pages. If this is accepted implemented, also the following should be considered before implementation: https://meta.decidim.org/processes/roadmap/f/122/proposals/14370 Especially on static content pages, I would believe there would be a need to have multiple blocks of the same type.