Improve size and positioning of trend arrow and value

[mthong]

Suggestion from @juliemeridian (moved from #87).

Move the rate-of-change arrow and value to the right so these can be side by side when room allows. It looks good to make the arrow a little bigger in this arrangement too.

See example here:
https://www.figma.com/file/YINuNVi5uN3iDdYKlkm2XDgP/CodeForSanJose-Economic-Indicators

[mthong]

Here's a screenshot from the link above.