task: Remove configuration files for taskopen

Since I am exclusively using `topen`
(https://git.martyoeh.me/Marty/topen) for my task notes currently, this
commit gets rid of any left-over config files setting up `taskopen`.
Starts to simplify the taskwarrior setup a tiny bit.

office/.config/sh/env.d/taskopen-xdg.sh

@@ -1,3 +0,0 @@
-#!/usr/bin/env sh
-
-export TASKOPENRC="${XDG_CONFIG_HOME:-"$HOME/.config"}/task/taskopenrc"

office/.config/task/taskopenrc

@@ -1,20 +0,0 @@
-[General]
-EDITOR = nvim
-taskbin = task
-path_ext = /usr/share/taskopen/scripts
-
-[Actions]
-note_custom_ext.regex = "^Note\\.?(.*)?"
-note_custom_ext.command = "$EDITOR ${XDG_DATA_HOME:-$HOME/.local/share}/task/notes/$UUID.$LAST_MATCH"
-
-notes.regex = "^Note$"
-notes.command = "$EDITOR ${XDG_DATA_HOME:-$HOME/.local/share}/task/notes/$UUID.md"
-
-links.regex = "^https?://"
-links.command = "open $FILE"
-
-mail.regex = "^<.*@.*>$"
-mail.command = "notmuch show mid:${FILE:1:-1}"
-
-[CLI]
-