emacs: update configuration for modus-themes

I want the title for org sections to have different size and also to
have different colors. This is done by setting the
`modus-themes-scale-headings` variable to true, and configuring the
various `modus-themes-scale-*` variables. The coloring is controlled
with `modus-themes-headings`.

Make the highlight line a bit more intense so that it's easier to spot
on the screen.

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