Rename "master" branch to main

[ARitz-Cracker]

Because people are increasingly unable to separate the contexts behind words, and the fact that we must provide a safer environment for people with thin skins and inability to take constructive criticisms, we must start censoring ourselves in the name of inclusivity.

I'm sure everyone can agree with me that unlimited inclusivity, even to the point of lowering standards for skill and emotional maturity, in an industry that routinely handles sensitive user data is a very good idea and will in no way backfire, nor has it ever done in the past.

In order for HTML9RBSJS to truly reflect the current state in the industry, we must truly embrace this monumental change that will definitely solve systemic-social issues and is in no way pointless virtue signalling.

[ARitz-Cracker]

I've added a description to justify this change, not that it needs any justification, anyway. It's the right thing to do, after all.