make v2 the migration version to codeberg (#2)

doc.go

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+/*
+Package swayipc can be used to control sway, swayfx and possibly
+i3wmwindow managers via a unix domain socket.
+
+swaywm's interprocess  communication (or  ipc) is the  interface sway,
+swayfx and i3wm use to  receive commands from client applications such
+as  sway-msg.   It  also  features  a  publish/subscribe  mechanism  for
+notifying interested parties of window manager events.
+
+swayipc is a go module for  controlling the window manager. This project
+is intended to  be useful for general scripting,  and for applications
+that interact  with the  window manager  like status  line generators,
+notification daemons, and window pagers. It is primarily designed to
+work with sway and swayfx, but may also work with i3wm, although I
+haven't tested it on i3wm.
+
+The module uses the i3-IPC proctocol as outlined in sway-ipc(7).
+*/
+package swayipc