Revert "Back to the original idea of using boolean false"

This reverts commit 0473647e43d686c84420abc72af3a27e54e1b6c2.
Revert "Configurable favicon: reformat code for jshint tests"

This reverts commit d4873394143bb5dbf1e46aa278fd6fcd5f89c979.
Revert "Configurable favicon in config/middleware.json"

This reverts commit 592206eb287231422da16842f9f128ed960dd990.