add link following keybind to mypwarun

This is imperfect, since it kicks me back to normal mode afterward,
rather than insert mode. It's better than not being able to follow
links because of misbehaving page javascript like discord's, though.

homeConfigurations/tejing/browser/default.nix

@@ -73,6 +73,7 @@ in
       imap <A-F4> <:quitall>
       imap <C-A-n> <toNormalMode>
       imap <C-A-r> <refreshTab>
+      imap <C-A-f> <startFollowNewTab>
       call <toInsertMode>
       EOF
       exec mylaunch app "pwarun-$name" ${my.pkgsUnstable.vieb}/bin/vieb --erwic="$dir/erwic.json" --datafolder="$dir/datafolder" --config-file="$dir/viebrc"