cleaned up redirection urls (#1969)

* cleaned up redirection urls

* add back modules, other best effort redirects

* fmt

src/ocamlorg_web/lib/redirection.ml

@@ -198,14 +198,16 @@ let from_v2 =
     ( "/learn/tutorials/compiling_ocaml_projects.html",
       Url.tutorial "compiling-ocaml-projects" );
     ( "/learn/tutorials/data_types_and_matching.fr.html",
-      Url.tutorial "data-types" );
+      Url.tutorial "basic-data-types" );
     ( "/learn/tutorials/data_types_and_matching.it.html",
-      Url.tutorial "data-types" );
+      Url.tutorial "basic-data-types" );
     ( "/learn/tutorials/data_types_and_matching.ja.html",
-      Url.tutorial "data-types" );
-    ("/learn/tutorials/data_types_and_matching.html", Url.tutorial "data-types");
+      Url.tutorial "basic-data-types" );
+    ( "/learn/tutorials/data_types_and_matching.html",
+      Url.tutorial "basic-data-types" );
     ( "/learn/tutorials/data_types_and_matching.zh.html",
-      Url.tutorial "data-types" );
+      Url.tutorial "basic-data-types" );
+    (Url.tutorial "data-types", Url.tutorial "basic-data-types");
     ("/learn/tutorials/debug.html", Url.tutorial "debugging");
     ("/learn/tutorials/error_handling.html", Url.tutorial "error-handling");
     ( "/learn/tutorials/file_manipulation.ja.html",
@@ -215,16 +217,17 @@ let from_v2 =
       Url.tutorial "file-manipulation" );
     ("/learn/tutorials/format.fr.html", Url.tutorial "formatting-text");
     ("/learn/tutorials/format.html", Url.tutorial "formatting-text");
-    ( "/learn/tutorials/functional_programming.fr.html",
-      Url.tutorial "functional-programming" );
-    ( "/learn/tutorials/functional_programming.it.html",
-      Url.tutorial "functional-programming" );
-    ( "/learn/tutorials/functional_programming.ja.html",
-      Url.tutorial "functional-programming" );
-    ( "/learn/tutorials/functional_programming.html",
-      Url.tutorial "functional-programming" );
-    ( "/learn/tutorials/functional_programming.zh.html",
-      Url.tutorial "functional-programming" );
+    (* FIXME: uncomment when higher-order-functions is merged (
+       "/learn/tutorials/functional_programming.fr.html", Url.tutorial
+       "higher-order-functions" ); (
+       "/learn/tutorials/functional_programming.it.html", Url.tutorial
+       "higher-order-functions" ); (
+       "/learn/tutorials/functional_programming.ja.html", Url.tutorial
+       "higher-order-functions" ); (
+       "/learn/tutorials/functional_programming.html", Url.tutorial
+       "higher-order-functions" ); (
+       "/learn/tutorials/functional_programming.zh.html", Url.tutorial
+       "higher-order-functions" ); *)
     ("/learn/tutorials/functors.html", Url.tutorial "functors");
     ( "/learn/tutorials/garbage_collection.ja.html",
       Url.tutorial "garbage-collection" );
@@ -273,16 +276,6 @@ let from_v2 =
     ("/learn/tutorials/modules.ko.html", Url.tutorial "modules");
     ("/learn/tutorials/modules.html", Url.tutorial "modules");
     ("/learn/tutorials/modules.zh.html", Url.tutorial "modules");
-    ( "/learn/tutorials/null_pointers_asserts_and_warnings.fr.html",
-      Url.tutorial "null-pointers-asserts-and-warnings" );
-    ( "/learn/tutorials/null_pointers_asserts_and_warnings.it.html",
-      Url.tutorial "null-pointers-asserts-and-warnings" );
-    ( "/learn/tutorials/null_pointers_asserts_and_warnings.ja.html",
-      Url.tutorial "null-pointers-asserts-and-warnings" );
-    ( "/learn/tutorials/null_pointers_asserts_and_warnings.html",
-      Url.tutorial "null-pointers-asserts-and-warnings" );
-    ( "/learn/tutorials/null_pointers_asserts_and_warnings.zh.html",
-      Url.tutorial "null-pointers-asserts-and-warnings" );
     ("/learn/tutorials/objects.ja.html", Url.tutorial "objects");
     ("/learn/tutorials/objects.html", Url.tutorial "objects");
     ("/learn/tutorials/objects.zh.html", Url.tutorial "objects");
@@ -291,13 +284,11 @@ let from_v2 =
     ("/learn/tutorials/performance_and_profiling.html", Url.tutorial "profiling");
     ( "/learn/tutorials/performance_and_profiling_discussion.html",
       Url.tutorial "profiling" );
-    ("/learn/tutorials/pointers.html", Url.tutorial "pointers");
-    ("/learn/tutorials/pointers.zh.html", Url.tutorial "pointers");
     ("/learn/tutorials/set.fr.html", Url.tutorial "sets");
     ("/learn/tutorials/set.ja.html", Url.tutorial "sets");
     ("/learn/tutorials/set.html", Url.tutorial "sets");
     ("/learn/tutorials/set.zh.html", Url.tutorial "sets");
-    ("/learn/tutorials/streams.html", Url.tutorial "streams");
+    ("/learn/tutorials/streams.html", Url.tutorial "sequences");
     ("/learn/tutorials/up_and_running.html", Url.tutorial "up-and-running");
     (Url.tutorial "first-hour", Url.tutorial "tour-of-ocaml");
     ("/meetings/index.fr.html", Url.community);