pidgin/pidgin

Modernize desktop file
release-2.x.y
2022-05-12, Richard Laager
a7351d3a2f0a
Modernize desktop file

- Set Name to just Pidgin
- Add X-GNOME-FullName. This follows a GNOME recommendation.
- Update Comment to remove old networks.
- Add Keywords
- Add GTK to Categories. This isn't critical, but GNOME had this in an
example.

Reviewed at https://reviews.imfreedom.org/r/1433/
For information on writing a plugin for Purple, Pidgin or Finch, go
http://developer.pidgin.im and click on API. From there, see the
HOWTOs in the "Related Pages" section.
You can also generate this documentation locally by installing
doxygen and graphviz dot, then running "make docs" in the
source tree. The documentation will be in the docs/html directory.