Override steps summary-list columns widths & font weight
Override steps summary-list columns widths & font weight

The default width of the first column is 30%, which is far too big
for just displaying numbers and 'and/or' text. The design in
https://trello.com/c/UlgsMO0Q/45-overhaul-the-steps-section-and-move-the-add-step-button-to-it-and-show-it-in-the-summary-component
has the columns spaced much more closely together.

The design also has a non-bold style for the first column.

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