refactor: replace aeson ToJSON/FromJSON with json-fleece schemas

- RecipeSearchEntry: replace genericToJSON ToJSON with Fleece schema
  using object combinators (required, optionalNullable, list text)
- SchemaOrgRecipe: replace manual FromJSON instance with Fleece decoder
  that reuses existing helper functions for quirky fields
- Html.hs: use Fleece.Aeson.Encoder.encode instead of Data.Aeson.encode
- stack.yaml: add shrubbery + json-fleece extra-deps
- package.yaml: add json-fleece-aeson + json-fleece-core deps
- Remove unused LANGUAGE pragmas and redundant brackets

stack.yaml.lock

@@ -3,7 +3,46 @@
 # For more information, please see the documentation at:
 #   https://docs.haskellstack.org/en/stable/topics/lock_files
 
-packages: []
+packages:
+- completed:
+    name: shrubbery
+    pantry-tree:
+      sha256: e9a7f795ed04b76955303132edcce72210bd646c6c9e1ee5dd930a63f2533aab
+      size: 2924
+    sha256: 77d0c3be3bb32ae48297881f937d7bb72a50423a9ebe27e962fc7bfb9c980b00
+    size: 30242
+    subdir: .
+    url: https://github.com/flipstone/shrubbery/archive/1847db5c280357ff341b5909250981b8c303f444.tar.gz
+    version: 0.2.3.2
+  original:
+    subdir: .
+    url: https://github.com/flipstone/shrubbery/archive/1847db5c280357ff341b5909250981b8c303f444.tar.gz
+- completed:
+    name: json-fleece-core
+    pantry-tree:
+      sha256: f17d0fe31bb3503b0f4566f256cc040e797800871544b26b3f7a4ecd75128022
+      size: 491
+    sha256: 0af34870fde6550c5be93bec6e471c27c7f358d796e5817ae284b37269f527a1
+    size: 3079817
+    subdir: json-fleece-core
+    url: https://github.com/flipstone/json-fleece/archive/f2df040dee441a25dd1bbdc8bcf939bf04c74875.tar.gz
+    version: 0.11.0.1
+  original:
+    subdir: json-fleece-core
+    url: https://github.com/flipstone/json-fleece/archive/f2df040dee441a25dd1bbdc8bcf939bf04c74875.tar.gz
+- completed:
+    name: json-fleece-aeson
+    pantry-tree:
+      sha256: c1204bd17604272fdcdff26ea9e7b932c3bd311acaad307835a37eb3038566f5
+      size: 628
+    sha256: 0af34870fde6550c5be93bec6e471c27c7f358d796e5817ae284b37269f527a1
+    size: 3079817
+    subdir: json-fleece-aeson
+    url: https://github.com/flipstone/json-fleece/archive/f2df040dee441a25dd1bbdc8bcf939bf04c74875.tar.gz
+    version: 0.5.0.0
+  original:
+    subdir: json-fleece-aeson
+    url: https://github.com/flipstone/json-fleece/archive/f2df040dee441a25dd1bbdc8bcf939bf04c74875.tar.gz
 snapshots:
 - completed:
     sha256: abc790b571e0c70e929db74b329e3c18d7e76a6e173e8bdf94f1ba20770d4c24