Enrich snippet JSON files with prev/next/related fields

Add navigation and related pattern data extracted from HTML pages:
- prev: previous pattern path (category/slug)
- next: next pattern path (category/slug)
- related: array of 3 related pattern paths

These fields complete the JSON data needed to generate HTML from templates.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

collections/collectors-teeing.json

@@ -30,5 +30,12 @@
       "desc": "Merge into a record or value object directly."
     }
   ],
-  "support": "Widely available since JDK 12 (March 2019)"
+  "support": "Widely available since JDK 12 (March 2019)",
+  "prev": "collections/stream-tolist-shorthand",
+  "next": "collections/stream-toarray-typed",
+  "related": [
+    "collections/copying-collections-immutably",
+    "collections/unmodifiable-collectors",
+    "collections/stream-toarray-typed"
+  ]
 }

collections/copying-collections-immutably.json

@@ -30,5 +30,12 @@
       "desc": "Changes to the original don't affect the copy."
     }
   ],
-  "support": "Widely available since JDK 10 (March 2018)"
+  "support": "Widely available since JDK 10 (March 2018)",
+  "prev": "collections/immutable-set-creation",
+  "next": "collections/map-entry-factory",
+  "related": [
+    "collections/immutable-set-creation",
+    "collections/map-entry-factory",
+    "collections/immutable-list-creation"
+  ]
 }

collections/immutable-list-creation.json

@@ -30,5 +30,12 @@
       "desc": "Rejects null elements at creation time, failing fast."
     }
   ],
-  "support": "Widely available since JDK 9 (Sept 2017)"
+  "support": "Widely available since JDK 9 (Sept 2017)",
+  "prev": "language/exhaustive-switch",
+  "next": "collections/immutable-map-creation",
+  "related": [
+    "collections/immutable-map-creation",
+    "collections/immutable-set-creation",
+    "collections/sequenced-collections"
+  ]
 }

collections/immutable-map-creation.json

@@ -30,5 +30,12 @@
       "desc": "Null entries are rejected immediately."
     }
   ],
-  "support": "Widely available since JDK 9 (Sept 2017)"
+  "support": "Widely available since JDK 9 (Sept 2017)",
+  "prev": "collections/immutable-list-creation",
+  "next": "collections/immutable-set-creation",
+  "related": [
+    "collections/copying-collections-immutably",
+    "collections/sequenced-collections",
+    "collections/stream-tolist-shorthand"
+  ]
 }

collections/immutable-set-creation.json

@@ -30,5 +30,12 @@
       "desc": "No add/remove possible after creation."
     }
   ],
-  "support": "Widely available since JDK 9 (Sept 2017)"
+  "support": "Widely available since JDK 9 (Sept 2017)",
+  "prev": "collections/immutable-map-creation",
+  "next": "collections/copying-collections-immutably",
+  "related": [
+    "collections/copying-collections-immutably",
+    "collections/collectors-teeing",
+    "collections/stream-tolist-shorthand"
+  ]
 }

collections/map-entry-factory.json

@@ -30,5 +30,12 @@
       "desc": "Works perfectly with Map.ofEntries() for large maps."
     }
   ],
-  "support": "Widely available since JDK 9 (Sept 2017)"
+  "support": "Widely available since JDK 9 (Sept 2017)",
+  "prev": "collections/copying-collections-immutably",
+  "next": "collections/sequenced-collections",
+  "related": [
+    "collections/sequenced-collections",
+    "collections/immutable-map-creation",
+    "collections/immutable-list-creation"
+  ]
 }

collections/sequenced-collections.json

@@ -30,5 +30,12 @@
       "desc": "Works the same on List, Deque, SortedSet."
     }
   ],
-  "support": "Widely available since JDK 21 LTS (Sept 2023)"
+  "support": "Widely available since JDK 21 LTS (Sept 2023)",
+  "prev": "collections/map-entry-factory",
+  "next": "collections/stream-tolist-shorthand",
+  "related": [
+    "collections/collectors-teeing",
+    "collections/immutable-set-creation",
+    "collections/immutable-map-creation"
+  ]
 }

collections/stream-toarray-typed.json

@@ -30,5 +30,12 @@
       "desc": "One expression replaces the manual loop."
     }
   ],
-  "support": "Widely available since JDK 8 (March 2014)"
+  "support": "Widely available since JDK 8 (March 2014)",
+  "prev": "collections/collectors-teeing",
+  "next": "collections/unmodifiable-collectors",
+  "related": [
+    "collections/collectors-teeing",
+    "collections/map-entry-factory",
+    "collections/immutable-set-creation"
+  ]
 }

collections/stream-tolist-shorthand.json

@@ -30,5 +30,12 @@
       "desc": "stream → map → toList flows like English."
     }
   ],
-  "support": "Widely available since JDK 16 (March 2021)"
+  "support": "Widely available since JDK 16 (March 2021)",
+  "prev": "collections/sequenced-collections",
+  "next": "collections/collectors-teeing",
+  "related": [
+    "collections/collectors-teeing",
+    "collections/immutable-list-creation",
+    "collections/immutable-map-creation"
+  ]
 }

collections/unmodifiable-collectors.json

@@ -30,5 +30,12 @@
       "desc": "Rejects null elements during collection."
     }
   ],
-  "support": "Widely available since JDK 10 (March 2018)"
+  "support": "Widely available since JDK 10 (March 2018)",
+  "prev": "collections/stream-toarray-typed",
+  "next": "strings/string-isblank",
+  "related": [
+    "collections/immutable-map-creation",
+    "collections/immutable-set-creation",
+    "collections/map-entry-factory"
+  ]
 }