Create a reference page for the reactive plugin
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### What needs to get done
Create a reference page using the same template as the other plugin pages (e.g. [uv plugin](https://canonical-charmcraft.readthedocs-hosted.com/en/stable/reference/plugins/uv_plugin/)) for the reactive plugin.
The hidden reactive plugin piece under https://canonical-charmcraft.readthedocs-hosted.com/en/stable/reference/files/charmcraft-yaml-file/#parts can be used for this and replaced with a link to this reference page.
### Why it needs to get done
This documentation is in a bad spot.
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