base: Add sekizai block for adding js and css snippets
base: Add sekizai block for adding js and css snippets

rtrembecky/roots,matus-stehlik/glowing-batman,matus-stehlik/roots,tbabej/roots,matus-stehlik/glowing-batman,rtrembecky/roots,rtrembecky/roots,tbabej/roots,tbabej/roots,matus-stehlik/roots,matus-stehlik/roots