config: Terminus by default, and stop hiding knobs in the source

config.h now carries everything a reader would reasonably want to change:
both fonts, the liturgical palette and the fallback for an unlisted
colour, the selection rings, geometry, weekday headings, the detail-pane
labels, the window title, and which rank earns a badge and what it says.
Several of those were literals buried in colitur-x.c.

Default font is Terminus:pixelsize=20:antialias=false, matching st.
Terminus is a bitmap face, so it exists only at fixed pixelsizes -- the
list is in the comment, because asking for one it lacks silently gets a
substitute rather than an error.

Layout metrics now come from the font instead of magic numbers: line
height and the badge from XftFont ascent/descent in colitur-x, column
widths in characters rather than pixels in colitur-mu. Before this,
changing the font size left a 13px line height and a 110px date column
that quietly truncated their contents.

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