Rename the project

It is about to see some extensions, obsoleting the number three.

xB.adoc

@@ -1,8 +1,8 @@
 xB(1)
 =====
 :doctype: manpage
-:manmanual: uirc3 Manual
-:mansource: uirc3 {release-version}
+:manmanual: xK Manual
+:mansource: xK {release-version}
 
 Name
 ----
@@ -100,5 +100,5 @@ _/usr/share/xB/plugins/_::
 
 Reporting bugs
 --------------
-Use https://git.janouch.name/p/uirc3 to report bugs, request features,
+Use https://git.janouch.name/p/xK to report bugs, request features,
 or submit pull requests.