Replace instances of `.. page::` with:
```rst
.. raw:: pdf
PageBreak
```
This reduces my usage on the `preprocess` functionality I'd like to
remove.
This was done by executing this command:
```
find src -type f -name '*.rst' \
-exec sed -Ei 's/.. page::$/.. raw:: pdf\n\n PageBreak/g' {} \;
```
