🐛 FIX: --conversions read from file

[codecov[bot]]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (4983369) 85.76% compared to head (26fffbb) 85.76%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ======================================= Coverage 85.76% 85.76% ======================================= Files 10 10 Lines 1637 1637 ======================================= Hits 1404 1404 Misses 233 233 ``` | Flag | Coverage Δ | | |---|---|---| | pytests | `85.76% <50.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/executablebooks/rst-to-myst/pull/64?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks) | Coverage Δ | | |---|---|---| | [rst\_to\_myst/cli.py](https://app.codecov.io/gh/executablebooks/rst-to-myst/pull/64?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks#diff-cnN0X3RvX215c3QvY2xpLnB5) | `86.45% <50.00%> (ø)` | |

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