feat(menu): change background on page or children
feat(menu): change background on page or children

close https://github.com/bdronneau/grav-theme-bootflat/issues/9

bdronneau/grav-theme-bootflat,basti1dr/grav-theme-bootflat,bdronneau/grav-theme-bootflat,basti1dr/grav-theme-bootflat,bdronneau/grav-theme-bootflat,basti1dr/grav-theme-bootflat