The "About Lino" section of the current book is actually something that should be in the current man/lino doctree (which is currently online as guide.lino-framework.org). The subdomain "guide" is misleading. Reorganize the domain names according to the new separation:

www.lino-framework.org is for non-technical docs (both pre-sales info and user manuals)

docs.lino-framework.org is for technical docs (developers, contributors, hosters)