* feat: Add filtering for tradeable seeds
This change introduces a new feature to filter seeds based on their tradeability.
- Adds a link on the homepage to view all tradeable seeds.
- Modifies the seeds controller to support filtering by `tradeable_to`, allowing multiple values to be selected.
- Adds links to the seeds index page to filter by the various `tradeable_to` values.
* Update index.html.haml
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Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Daniel O'Connor <daniel.oconnor@gmail.com>
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