Misc fix for docs (#398)

* feat: construct trees with nested_dict_key_to_tree

* refactor: test clean up

* feat: export trees with tree_to_nested_dict_key

* feat: add docs

* docs: update CHANGELOG

* docs: enhance docstring

* refactor: abstract out export tree logic

* docs: update CHANGELOG

* refactor: shift to common file

* refactor: shift to common file

* refactor: shift to common file

* docs: misc fix

Author: kayjan

docs/gettingstarted/resources/articles.md

@@ -14,7 +14,7 @@ hide:
     Integrating trees with Python lists, dictionaries, and pandas DataFrames
 
     [:octicons-arrow-right-24: Read article](https://medium.com/data-science/python-tree-implementation-with-bigtree-13cdabd77adc)
--
+
 - :material-graph-outline:{ .lg .middle } __The Reingold Tilford Algorithm Explained, with Walkthrough__
 
     ---