Update installation instructions and GIF generation workflow

Author: httpdss

.github/workflows/generate-terminal-gifs.yaml

@@ -34,4 +34,3 @@ jobs:
           title: Update generated VHS GIF
           body: This PR updates the generated VHS GIF files.
           base: main
-          path: '*.gif'

docs/vhs/install.tape

@@ -63,8 +63,8 @@ Set Width 1200
 Set Height 600
 
 Type "# Create python virtual environment and install struct" Enter
-Type "python3 -m venv venv" Sleep 500ms Enter
-Type "source venv/bin/activate" Enter
+Type "python3 -m venv .venv" Sleep 500ms Enter
+Type "source .venv/bin/activate" Enter
 Type "pip install git+https://github.com/httpdss/struct.git" Sleep 500ms  Enter
 Type "# STRUCT is now installed and ready to use" Enter
 Type "struct list" Enter