sway/config.d/keyboard: import keyboard options from i3

conf/sway/config.d/keyboard.conf

@@ -1,4 +1,12 @@
+# My preferred keyboard configuration
+
+# alt-shift changes layout, both shifts together are caps lock, caps lock is
+# backspace (colemak style), nbsp is compose+space, compose is menu.
+# I am not sure Wayland recognises terminate, but here it is anyway.
+
 input "type:keyboard" {
-    xkb_layout "fi"
+    xkb_layout fi,us,epo,ru
+    xkb_variant ,altgr-intl,,phonetic_winkeys
     xkb_numlock enable
+    xkb_options grp:alt_shift_toggle,shift:both_capslock,caps:backspace,nbsp:none,terminate:ctrl_alt_bksp,compose:menu
    }