Update modus-themes to their 4.4.0 version

Update modus-themes to their 4.4.0 version

* doc/misc/modus-themes.org: Update the manual to better document
existing functionality and cover the new features.

* etc/themes/modus-operandi-deuteranopia-theme.el:
* etc/themes/modus-operandi-theme.el:
* etc/themes/modus-operandi-tinted-theme.el:
* etc/themes/modus-operandi-tritanopia-theme.el:
* etc/themes/modus-vivendi-deuteranopia-theme.el:
* etc/themes/modus-vivendi-theme.el:
* etc/themes/modus-vivendi-tinted-theme.el:
* etc/themes/modus-vivendi-tritanopia-theme.el: Update the
palette of each theme.

* etc/themes/modus-themes.el (require): Remove call to cl-lib
and do not use relevant functions.
(modus-themes-operandi-colors, modus-themes-vivendi-colors)
(modus-themes-version, modus-themes-report-bug): Remove old
calls to 'make-obsolete' and related.

(modus-themes--annotate-theme): Tweak the completion annotation function.

(modus-themes--org-block): Deprecate the user option 'modus-themes-org-blocks'.
(modus-themes-faces): Update faces.
(modus-themes-custom-variables): Update the list of custom
variables.

Detailed release notes are available here:
<https://protesilaos.com/codelog/2024-03-17-modus-themes-4-4-0/>.