v0.3.0 release

[wayneshn]

New features:

• Role-based access control and user management Role-based access #23
• System settings, multi-language support for frontend and backend System settings #65

Other improvements:

• Adds an option to permit self-signed certificates. This is particularly useful for development and testing environments where valid certificates may not be available. Add self signed SSL certificate option #71
• Optimizes the IMAP email fetching process by sharing a single connection across multiple fetch actions. This reduces connection overhead, leading to improved performance and reliability, especially when dealing with a large volume of emails. multiple imap logins #37
• Cleans up the docker-compose.yml file by removing unnecessary port mappings, enhancing security and simplifying the configuration. Default docker-compose.yml exposes far too many ports? #73
• Updates the documentation with a new section on how to troubleshoot and resolve Cross-Origin Resource Sharing (CORS) errors. Error when importing PST files - 403 Cross-site POST from submissions are forbidden #52