cubicweb #2719190 Make sqlite the default database when creating a cubicweb instance [rejected]

To reduce the number of dependencies for someone to try out CubicWeb, the default database backend used should be sqlite.

Simply add a warning says "feature X and feature Y will not work, switch to postgresql for that, or for a production site".

done in3.20.0
load left0.000
closed by<not specified>
patch[serverctl] make sqlite the default db-driver (closes #2719190) [rejected]