Revise colours for deadlines and scheduled tasks (Org agenda)

The goal is two-fold:

1. Improve the semantics of relevant faces. This now covers the Org
   agenda. We want pending/urgent tasks to be rendered in a bold font
   and use a vivid colour. Whereas tasks that are not urgent should
   have a subtle colour and a normal weight. Thanks to Adam
   Porter (GitHub @alphapapa) for discussing this with me in issue
   102 on the Modus themes repository (the same principles apply
   here): <https://github.com/protesilaos/modus-themes/issues/102>.

2. Make the applicable colours be more consistent with the rest of the
   theme. In practice, this means that the colour values are cooler
   overall and the intensity is lower.

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