Inserts the `summary` slides at the front of the deck (in order) and the
`conclusions` slides at the end. This is pure `officer` work with no network
access, so it can be unit-tested with a hand-written `story`.
Usage
add_story_slides(ppt, story)
Arguments
- ppt
An `officer::rpptx` object holding the generated content deck.
- story
A story `list` with `summary` and `conclusions` elements, each a
list of slides (see [get_ai_story()]).
Value
The modified `officer::rpptx` object.