Search improvements

The (admittedly very rudimentary) `search` parameter used by the GUI could be slightly less rudimentary for text fields, by using something like trigram similarity:

```
ExampleProject.objects.filter(field__trigram_word_similar="Mispeld words")
```

More info here:
https://docs.djangoproject.com/en/5.2/ref/contrib/postgres/lookups/
