Merge the github sites

[afmenez]

I believe there are too many sites, which is confusing (https://emojitwo.github.io/, https://github.com/EmojiTwo/emojitwo, https://github.com/EmojiTwo/emojitwo.github.io).
They should all be merged into one.

[Crissov]

https://emojitwo.github.io/ is intended as the homepage on the web for regular users. Currently it consists of a slightly varied README from the source repository, but that could and should change in the future.

https://github.com/EmojiTwo/emojitwo.github.io is the Github repository that holds the Jekyll source code for the website. We could probably generate it from the documentation as well, but I think it's cleaner this way. Only people who want to edit the website need to know about this repo.

https://github.com/EmojiTwo/emojitwo is the actual repository for the vector graphics source files (SVG), generated bitmaps (PNG), fonts etc. People can and should create forks of this, edit them and submit pull requests.