Issue #2398451 by idebr, Dragan Eror, thamas, DickJohnson, emma.maria, saki007ster, LewisNyman: Clean up "layout" CSS in Bartik

Issue #2398461 by DickJohnson, jp.stacey, idebr, rachel_norfolk, lauriii, Mukeysh, emma.maria: Clean up the "comments" component in Bartik

Issue #2398447 by emma.maria, rootwork, Maninder, ramkrk, DickJohnson, idebr: Remove the "typography" CSS file in Bartik

Issue #2396489 by herom, rachel_norfolk, WigglyKoala, emma.maria, vijaycs85, jjcarrion: Add missing RTL rules to Bartik theme CSS

Issue #2408653 by DickJohnson, LewisNyman: Remove lists.css from Bartik, add it's current code directly to the components it references

Issue #853800 by emma.maria, kattekrab, Jeff Burnz, eigentor, couturier, cafuego, dcrocks: Float image left in Bartik Articles

Issue #2375673 by DickJohnson, LewisNyman, lauriii, emma.maria, sqndr, Wim Leers, stephr: Split Bartik's CSS into SMACSS style components