The first columns of our tables are always headings for the
subsequent columns, even though they go horizontally.
HTML has the `<th>` tag, which doesn’t just have to be used for headings
along the top of a table. So this commit changes the first column to be
a `<th>`.
This then allows us to style these elements differently, specifically
making them 50% wide. This makes pages like the dashboard align more
nicely.
d213e2cc67