manager: Remove legacy PoC manager web application

This has not been developed for years and as far as web applications
go it has some serious (security) issues.  So just remove it.

scripts/test.sh

@@ -304,7 +304,7 @@ all|alpine|codeql|coverage|sonarcloud|no-dbg|no-testable-ke)
 		# no TrouSerS either
 		CONFIG="$CONFIG --disable-tss-trousers --disable-aikgen"
 		# and no Clearsilver
-		CONFIG="$CONFIG --disable-fast --disable-manager --disable-medsrv"
+		CONFIG="$CONFIG --disable-fast --disable-medsrv"
 	fi
 	if test "$1" = "build-deps"; then
 		build_botan