docs: remove demo section and screenshots from README.md

- Eliminated the demo section and associated YouTube video placeholder for a more concise README.
- Removed screenshots table to streamline content and focus on essential project information.

README.md

@@ -12,24 +12,6 @@ Gravity Flip lets you create anti-gravity regions on your Hytale server using a
 
 ---
 
-### Demo
-
-<!-- Replace VIDEO_ID with the YouTube video id once uploaded -->
-<p align="center">
-  <a href="https://www.youtube.com/watch?v=VIDEO_ID">
-    <img src="https://img.youtube.com/vi/VIDEO_ID/maxresdefault.jpg" alt="Gravity Flip — video demo" width="720"/>
-  </a>
-</p>
-<p align="center"><sub>Click to watch</sub></p>
-
-#### Screenshots
-
-| ![](docs/screenshots/01-wand-selection.png) | ![](docs/screenshots/02-region-outline.png) | ![](docs/screenshots/03-walk-on-ceiling.png) |
-| --- | --- | --- |
-| ![](docs/screenshots/04-item-fountain.png) | ![](docs/screenshots/05-dense-particles.png) | ![](docs/screenshots/06-showcase-arena.png) |
-
----
-
 ## What Does It Do?
 
 - Mark a region in game with a wand tool.