Beautify lowdown output

Author: NeYurii

nb

@@ -19218,7 +19218,7 @@ Can't show archives. Export archive and expand to edit.\\n"
               glow --pager
             elif [[ "${_markdown_tool:-}" == "lowdown" ]]
             then
-              lowdown -Tterm | _pager
+              COLS=$(tput cols) && lowdown -Tterm --term-width="$COLS" --term-columns="$COLS" --term-hmargin=1 | _pager
             elif [[ "${_markdown_tool:-}" == "mdcat"  ]]
             then
               mdcat --paginate