Refactor/improve recipe search

[miguelpduarte]

Depends on #5

Improve search by:

• Making it fully fuzzy (currently it is simply using String.contains?/2 - String.jaro_distance and String.bag_distance had some strange edge cases that made them not be useful for this feature, e.g. not sorting to the top with an exact match)
• Probably implement the search using the DB instead of filtering in the Elixir code directly
• Use schemaless changesets to perform parameter filtering and validation

See https://fullstackphoenix.com/tutorials/fuzzy-search-in-phoenix-liveview for some ideas