mention navigation tabs in README

Oleksandr Kulkov · web-flow · commit d29c6ba4ad04 · 2022-06-05T15:46:29.000+02:00
diff --git a/README.md b/README.md
@@ -16,6 +16,7 @@ Compiled pages are published at https://cp-algorithms.com/
 
 ## Changelog
 
+- June 5, 2022: Enabled content tabs and sidebar navigation. The navigation structure should be adjusted in [mkdocs.yml](https://github.com/e-maxx-eng/e-maxx-eng/blob/master/mkdocs.yml) whenever a new article is created or an old one is moved.
 - January 16, 2022: Switched to the [MkDocs](https://www.mkdocs.org/) site generator with the [Material for MkDocs](https://squidfunk.github.io/mkdocs-material/) theme, which give the website a more modern look, brings a couple of new features (dark mode, better search, ...), makes the website more stable (in terms of rendering math formulas), and makes it easier to contribute.
 
 ### New articles
