docs: add blog post Release: v0.16.0

Author: Chemaclass

content/blog/2024-12-01-release-0.16.md

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+title = "Release: v0.16.0"
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+
+## REPL improvements & cache override
+
+### 🥇 New Features
+
+- Improved REPL exception messages for better clarity and debugging
+- Display the root source file in error messages to help with debugging
+- Enabled overriding the cache directory via the `GACELA_CACHE_DIR` env variable (Gacela 1.9)
+- Added support for overriding docs data in `PhelFnLoader`
+
+### 🐛 Bug Fixes
+
+- Fixed issue where temporary files weren't being removed in `Phel::run()`
+
+### 🏗️ Miscellaneous
+
+- Removed unused `ExceptionHandler`
+- Updated Rector and applied necessary fixes
+- Upgraded PHPUnit to version 10
+
+## Full list
+
+For a full list of changes, have a look at the  [release notes](https://github.com/phel-lang/phel-lang/releases/tag/v0.16.0).