Docx writer: move a couple more vars to ReaderT

In general, we want things that are either:

 1. unchanging environment variables, or
 2. environment variables that will change for a the scope of
    a function and then pop back

to be in the reader monad. This is safer for (1), since we won't
accidentally change it, and easier for (2), since we can use `local`
instad of setting the old value and then resetting.

We keep the StateT monad for values that we will want to accumulate or
change and then use later.

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