task: Integrate into office module

Since I am striving for closer connection between my task management, my
mail suite and my calendar appointments, it makes sense to unify all
'office' tasks into the single office module instead of keeping
taskwarrior outside of it.

office/.config/sh/alias.d/timewarrior.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env sh
+
+if ! exist timew; then
+    return 1
+fi
+
+# invoking tim without arguments prints out timesheet summary
+# with ids attached.
+# otherwise tim passes through any arguments to timew
+tim() {
+    if [ "$#" -eq 0 ]; then
+        timew summary :ids
+    else
+        timew "$@"
+    fi
+}