feat(edit-docs): integrate release notes into repo

docs/Release Notes/Release Notes/v0.90.2-beta.md

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+# v0.90.2-beta
+## 🐞 Bugfixes
+
+*   [(Bug report) Initial sync doesn't finish](https://github.com/TriliumNext/Notes/issues/266)
+
+## ✨ Technical Improvements
+
+Important changes:
+
+*   The biggest change is that the server has been ported from Common.js to ES Modules. Note that a change of this proportion is bound to cause some quirks throughout the application, bug reports are welcome.
+*   Updated Electron from 25.9.8 to 31.2.1 ([#231](https://github.com/TriliumNext/Notes/pull/231))
+
+Additionally:
+
+*   Updated CKEditor from 41.0.0 to 41.4.2.
+*   Started adding support for internationalization ([#248](https://github.com/TriliumNext/Notes/pull/248)). The application will soon be able to be translated into multiple languages.
+*   Improved error management for scripting:
+    *   If a critical unexpected error occurs from a widget, a toast is shown explaining the situation and advising to enter safe mode, as opposed to a blank page.
+    *   If a basic widget fails to render, a toast is shown instead of crashing the application.
+*   Toast messages now support newlines (by adding a `\n` to the message) for slightly better formatting.