Originally the plan was to have two chapters about reading text files, a brief introduction in the whole game, and then a more detailed exploration later in the book. This organisation didn't seem to work very well because the second chapter didn't have much content, so I've removed it, integrating its content elsewhere in the book:
* Column parsing types moved back into data-import
* Specifics of parsing various data types (e.g. `col_number()`, `col_date()`, and `col_factor()`) moved into the corresponding data type chapters.
* String encoding has moved to the strings chapter
While I was in here I also removed the unused `import-other.qmd`; we had planned to survey other options but I no longer think this is worth it.
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