docs: fix the dev config gap and the removed ARGB settings

Two defects found while running Task 4, both confirmed against the
conky build rather than assumed.

Task 4's development config defined color1..color7 and default_color
but not default_shade_color, which palette() reads for the card fill,
so following the plan verbatim drew every card in the magenta sentinel.
The config now carries it, with a note saying why it is required.

own_window_argb_visual has been REMOVED in conky 1.24 (ARGB is always
on when available) and own_window_argb_value is deprecated; both warn
on this build. Replaced with own_window_colour '#AARRGGBB', which emits
no warnings. In the template that value follows the palette through a
new @BODY_SHADE_RAW@ placeholder, the shade colour without its leading
'#', so a scheme switch recolours the window backdrop too rather than
pinning it to one hardcoded hex.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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