typikon is a binary now, so cargo install, not pipx

The install line still said pipx, which stopped being true when the engine was
rewritten. It is one static binary with the calendar compiled in, so there is
no runtime to install and no data file to find.

Also points a Byzantine Catholic at --typikon while they are setting a default,
since the flag is the one most of them will want, and notes that anything the
widget does not set follows what typikon remembered, so a widget and a terminal
on the same machine agree.

bin/menologion-install

@@ -82,7 +82,7 @@ NOTE
 require_typikon() {
     command -v typikon >/dev/null 2>&1 && return 0
     echo "menologion: typikon is not on PATH." >&2
-    echo "  pipx install git+https://git.pumpin.online/funkpower/typikon" >&2
+    echo "  cargo install --git https://git.pumpin.online/funkpower/typikon" >&2
     exit 1
 }