* doc/misc/modus-themes.org: Add new version of the manual, with
changes to markup and references to the latest state of the project.
* etc/themes/modus-vivendi-theme.el:
* etc/themes/modus-operandi-theme.el: Provide updated version of each
theme, which expands the contents of 'modus-themes.el' (bug#45068).
* etc/themes/modus-themes.el: Add new supportive file. This is where
theme data, functions, and face definitions are defined.
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