Release v0.3.0

What's Changed

• Migrate from react-markdown to remark by @lordmathis in #12
• Fix wrong package.json by @lordmathis in #13
• User authentication and account settings by @lordmathis in #14
• Restructure components by @lordmathis in #15
• Admin dashboard by @lordmathis in #16
• Implement Rate Limit, Secure Headers and CORS by @lordmathis in #17
• Implement show hidden files setting by @lordmathis in #18
• Rename root folders by @lordmathis in #19
• Implement backend tests by @lordmathis in #20
• Split main into app package by @lordmathis in #21
• Fix missing commit author name and email by @lordmathis in #22
• Update README by @lordmathis in #23

Full Changelog: v0.2.0...v0.3.0