Ligatures confuse search

Try `search?query=%EF%AC%82ee` (or as it copies from photo description, `flee`) versus `search?query=flee`.

Related: https://github.com/guardian/grid/issues/1900

Reproduce the behavior with the two `search?query=` URLs in the issue, comparing the `flee` ligature with `flee`. Start at the search endpoint and trace how query text is handled; done means both queries return equivalent search results, with the related issue #1900 providing additional context.

Written by the indexing model from the issue text.