docs: update docs for release 0.4.1 (#99)

* docs: include hierarchical processor

docs/modules/models.rst

@@ -13,3 +13,29 @@ encoder, processor, and decoder.
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+**********************************************
+ Encoder Hierarchical processor Decoder Model
+**********************************************
+
+This model extends the standard encoder-processor-decoder architecture
+by introducing a **hierarchical processor**.
+
+Compared to the AnemoiModelEncProcDec model, this architecture requires
+a predefined list of hidden nodes, `[hidden_1, ..., hidden_n]`. These
+nodes must be sorted to match the expected flow of information `data ->
+hidden_1 -> ... -> hidden_n -> ... -> hidden_1 -> data`.
+
+A new argument is added to the configuration file:
+`enable_hierarchical_level_processing`. This argument determines whether
+a processor is added at each hierarchy level or only at the final level.
+
+By default, the number of channels for the mappers is defined as `2^n *
+config.num_channels`, where `n` represents the hierarchy level. This
+scaling ensures that the processing capacity grows proportionally with
+the depth of the hierarchy, enabling efficient handling of data.
+
+.. automodule:: anemoi.models.models.hierarchical
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