docs: update demo gif url

Author: esadek

README.md

@@ -13,7 +13,7 @@ SPDX-License-Identifier: Apache-2.0
 
 A command-line tool for querying databases via [ADBC](https://arrow.apache.org/adbc/current/index.html).
 
-<img alt="databow demo" src="docs/assets/demo.gif" width="600" />
+<img src="https://raw.githubusercontent.com/columnar-tech/databow/refs/heads/main/docs/assets/demo.gif" width="600" />
 
 ## Highlights