Develop Akita for Safari

[sharon-wang]

Mentioned in https://github.com/esse-dev/akita/issues/74, we may consider developing Akita as a Safari browser extension.

Some resources:

• https://developer.apple.com/news/?id=qiz0arxc
• https://developer.apple.com/documentation/safariservices/safari_web_extensions
• https://developer.apple.com/app-store/review/guidelines/#extensions
• https://developer.apple.com/documentation/safariservices/safari_web_extensions/assessing_your_safari_web_extension_s_browser_compatibility
• https://developer.apple.com/documentation/safariservices/safari_web_extensions/troubleshooting_your_safari_web_extension
• https://developer.apple.com/documentation/safariservices/safari_web_extensions/distributing_your_safari_web_extension