[presentations] Add category and NotGDC first presentation.

content/presentations/_index.md

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+---
+title: Presentations
+menu_title: Presentations
+layout: rss-list
+---

content/presentations/notgdc-2023/index.en.md

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+---
+title: "NotGDC 2023"
+mobile_menu_title: "NotGDC 2023"
+get_in_touch: true
+date: 2023-03-23
+news_keywords: [ "NotGDC", "LOVE2D", "Game Development", "gamedev", "Yui", "user interface", "UI" ]
+---
+
+## NotGDC 2023
+
+During [NotGDC 2023](https://notgdc.io) we introduce [Yui](https://gitea.it/1414codeforge/yui) -- **Yet another User Interface** library.
+
+
+You can use it to effortlessly create user interfaces for your game,
+using the [LÖVE](https://love2d.org) 2D game engine.
+Its main features are:
+
+- Declarative approach to interface building
+- Extensible widget library
+- Out of the box localization support
+- Intuitive widget layout on screen
+- Built-in navigation via mouse, joystick or keyboard
+- Reasonably small and hackable codebase
+
+The following slides summarize **Yui**'s strong points and give a taste of how it looks and feels - on code and on screen.
+
+Enjoy!
+
+[Download PDF](notgdc-2023-yui.pdf)