Issue #2470233 by wadmiraal, emma.maria, sxnc, idebr, googletorp, LewisNyman: Fix the visual bugs in the Bartik footer

Issue #2398445 by jp.stacey, LewisNyman, Manjit.Singh, pjbaert, emma.maria, ti2m: Clean up the "elements" component in Bartik

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

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

Issue #2399709 by DickJohnson, idebr, LewisNyman: Remove media.css from Bartik, add it's current code directly to the components it references

Issue #2142653 by corbacho, sqndr, LewisNyman, floretan, BarisW, G-raph, JamesLefrère, lokapujya, LoMo, Outi: Change default logo filetype to .svg and add an SVG version of Druplicon

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