Install scripts

[ivnglkv]

Created installation scripts for Windows (PowerShell) and macOS/Linux (Bash). These scripts should replace long one-liners we use to start app on non-developer's machines.
Also Docker Compose files were updated thus old commands will no longer work.

Docker Compose configuration changes:

• All managed resources are labeled so it becomes easy to uninstall them
• MongoDB is not started in all configurations except production
• CI has a separate override file because Docker Compose version on the GitHub Actions runner seems to be not supporting !reset instruction on service level.

Installation script basic behaviour:

1. Cleanup old Docker resources (based on the Docker label) and files in the current directory (docker-compose.yaml, docker-compose.override.yaml, browsers.json and .env)
2. Download required files
3. Start application

Available configurations:

1. Changing branch used as a source for files download.
2. Changing Docker image tag, effectively changing the version of application being launched.
3. Altering amount of parallel Selenoid sessions.
4. Changing Docker Compose pull policy.
5. Running Docker Compose in detached mode.
6. Skipping cleanup stage.