build de documentation with furo

debian/control

@@ -13,6 +13,7 @@ Build-Depends: debhelper-compat (= 13),
                python3-sphinx <!nodoc>,
                python3-sphinx-rtd-theme <!nodoc>,
                python3-sqlalchemy (>= 1.3.22) <!nocheck> <!nodoc>,
+               furo <!nodoc>,
                sphinx-common
 Standards-Version: 4.0.0
 Vcs-Browser: https://salsa.debian.org/python-team/packages/python-agate-sql