Output additional documented action parameters settings: env_name, default_value, optional, conflicting_options

`available_options` already contains information about if a param is optional, if there is a default value for a param, and if there is a environment variable that can be used to set an action parameter.

This should be surfaced in the param table of the action documentation somehow.

Ideas:
- Hover title / tooltip for param name
- Additional columns
- Folding dropdown (similar to ``) thingie next to description

### Tasks

- [x] default_value
- [ ] optional / required
- [ ] conflicting_options
- [ ] env_name