A couple of small changes that surfaced linting the entire readthedocsinc codebase:

• No need for utf8 header in files anymore
• https://github.com/rtfd/readthedocs-corporate/pull/463/files/5c179ca89339adb3c59d43ab8cc36044f1146708..2f9f47fc69fb2df467f4f17261cf8613850f3d7a#diff-b48d75844df80305a816a632c69f63fd
• https://github.com/rtfd/readthedocs-corporate/pull/463/files/5c179ca89339adb3c59d43ab8cc36044f1146708..2f9f47fc69fb2df467f4f17261cf8613850f3d7a#diff-9bb2189bdb7f183f9a7f6731866b3677