tmux: Limit taskwarrrior session burndown display

Set burndown chart to only display last 3 months of tasks. I have found
this (for now) to be the best balance between getting a general sense of
overview and still having a meaningful output.
The problem with just basic `burndown` command is that, after using
taskwarrior for a while, your completed tasks *will* pile up (I think I
am at around 1000 now) and the burndown chart, showing relative balance
of completed, pending, working on, will become meaningless. It will only
ever display a large portion of green --- completed --- tasks and not
give a lot of insight.
Setting it to only 1 month back, or even just a week, can work but for
me does not present enough of a tracking overview. I want to see,
relatively, how well I am doing over the last couple of weeks instead of
just today against the days before.
This setting might still change as my needs change.

tmux/.config/tmux/sessions/todo.session

@@ -4,7 +4,7 @@ new-window -n dash
 send-keys "cd ${XDG_DATA_HOME:-~/.local/share}/task/; fd . | entr -c task next" C-m
 split-window -h -l 71
 send-keys "cd ${XDG_DATA_HOME:-~/.local/share}/task/; fd . | entr -c task summary" C-m
-split-window -v "cd ${XDG_DATA_HOME:-~/.local/share}/task/; fd . | entr -c task burndown"
+split-window -v "cd ${XDG_DATA_HOME:-~/.local/share}/task/; fd . | entr -c task end.after=tod-3m or entry.after=tod-1m burndown"
 select-pane -t 1
 split-window -v -l 5
 send-keys "t" Space