pidgin/pidgin

Refresh the README as a few things have moved and some of the wording was weird.

2021-03-19, Gary Kramlich
b09ca0df70cb
Refresh the README as a few things have moved and some of the wording was weird.

Testing Done:
Read it a few times.

Reviewed at https://reviews.imfreedom.org/r/568/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in