Use inplace-{conf,install} instead of maintainer-{conf,install}

Since we do not actively develop on this environment we can use the
optimizations.

Not sure why the 1 was missing on QUIET so added it just in case.

Author: thijskh

update_demoweb.sh

@@ -17,8 +17,8 @@ git pull -q --rebase --autostash >/dev/null 2>&1
 # Rebuild in-place to also make configuration updates visible:
 make QUIET=1 maintainer-clean
 make QUIET=1 MAINT_CXFLAGS='-g -O2 -Wall -fPIE -Wformat -Wformat-security' \
-	maintainer-conf || true
-make QUIET= maintainer-install docs >/dev/null 2>&1
+	inplace-conf || true
+make QUIET=1 inplace-install docs >/dev/null 2>&1
 composer auto-scripts >/dev/null 2>&1
 
 # Reset database to known good state: