fix #5917: convert some style code from Jupyter class for tables to make cocalc default table output in Jupyter notebooks look more like Jupyter classic/lab
fix #5917: convert some style code from Jupyter class for tables to make cocalc default table output in Jupyter notebooks look more like Jupyter classic/lab

sagemathinc/smc,sagemathinc/smc,sagemathinc/smc,sagemathinc/smc