Add 2.5 release notes

docs/content/articles/flex-pelican-theme-2-5.md

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+Title: Flex 2.5.0
+Date: 2022-08-31 08:00
+Modified: 2022-08-31 08:00
+Category: News
+Tags: pelican, python, theme
+Slug: flex-pelican-theme-update-2-5
+Cover: images/flex-screenshot.png
+
+[Flex theme](https://github.com/alexandrevicenzi/Flex) 2.5.0 comes with minor fixes and big improvments.
+
+- Added support for [Pelican Search](https://github.com/pelican-plugins/search) plugin as [Tipue Search](https://github.com/getpelican/pelican-plugins/tree/master/tipue_search) is deprecated
+  - Tipue Search support will be removed in Flex 3.0
+- Added support for [SEO](https://github.com/pelican-plugins/seo) plugin
+- Added support for [Series](https://github.com/pelican-plugins/series) plugin
+- Added support for [Microsoft Clarity](https://clarity.microsoft.com/)
+- Added support for Google Analytics v4
+- Updated translations
+- Improved styles for Table of Contents and Figure with captions, as well other small fixes
+
+For more details check our [Wiki](https://github.com/alexandrevicenzi/Flex/wiki).
+
+The next Flex version will be 3.0 and it will bring a few changes to the theme structure, introducing a few configuration changes.
+Over the years many features were added to Flex theme and some with not much care.
+Because of this, code cleanup is needed to allow theme maintenance in the future.
+Pelican also changed, and some features present in Flex are now available in Pelican or as new plugins. It's time to review everything done so far.
+
+Hope you enjoy this version and stay tuned for Flex 3.0.