update readme and demo gif

Author: srixivas

Dockerfile.demo

@@ -0,0 +1,8 @@
+FROM ghcr.io/charmbracelet/vhs
+
+RUN apt-get update --allow-releaseinfo-change && \
+    apt-get install -y --no-install-recommends python3 python3-pip && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt /tmp/requirements.txt
+RUN pip3 install --break-system-packages -r /tmp/requirements.txt

Makefile

@@ -56,7 +56,8 @@ run-kml:
 
 ## demo: Record CLI demo GIF using VHS in Docker (writes samples/urlrecondemo.gif)
 demo:
-	docker run --rm -v "$(PWD)":/vhs ghcr.io/charmbracelet/vhs demo.tape
+	docker build -f Dockerfile.demo -t urlrecon-vhs .
+	docker run --rm -v "$(PWD)":/vhs urlrecon-vhs demo.tape
 
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