INFRA-163 Convert/archive old civicon website to static HTML
Request from MM: convert old (> 1 year) civicon sites to HTML, in order to reduce maintenance, security risks and performance.
- add block "this site has been archived on [date]"
- disable user module
- run crawler
Koumbit has a step-by-step doc in French (sort of): https://wiki.koumbit.net/Fossilisation