Refactor Docker setup and add mock data support

- Updated .dockerignore and .gitignore for better file management.
- Introduced .env.example for environment variable configuration.
- Added docker-compose.dev.yml for development with mock data and live reload.
- Enhanced Dockerfile to include necessary dependencies and entrypoint script.
- Created mock_data.py to provide sample data for testing without OpenStack/Prometheus.
- Added unit tests for template filters in dashboard.
- Cleaned up various files for consistency and improved readability.

.gitignore

@@ -1,26 +1,28 @@
-# Python
-*.pyc
-__pycache__/
-venv/
-.env
-db.sqlite3
-
-# Django
-media/
-staticfiles/
-
-# Compiled CSS
-watcher_visio/static/css/output.css
-watcher_visio/static/css/tailwindcss
-watcher_visio/static/css/tailwindcss.exe
-
-# IDE
-.vscode/
-.idea/
-
-# DaisyUI
-static/css/output.css
-static/css/tailwindcss
-
-# NodeJS
-node_modules
+# Python
+*.pyc
+__pycache__/
+venv/
+.env
+db.sqlite3
+
+# Django
+media/
+staticfiles/
+
+# Compiled CSS
+watcher_visio/static/css/output.css
+watcher_visio/static/css/tailwindcss
+watcher_visio/static/css/tailwindcss.exe
+
+# IDE
+.vscode/
+.idea/
+
+# DaisyUI
+static/css/output.css
+static/css/tailwindcss
+
+# NodeJS
+node_modules
+
+clouds.yaml