Add lemonsaurus lemoji

[ghost]

Add lemonsaurus lemoji.
Inspired by lemon's Github username.

Screenshot in discord:

Image:

[ghost]

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[ghost]

Waiting for #59 to merge to change the lemonsaurus head.

[lemonsaurus]

I think this is fun, and I don't mind adding it to the emoji roster in our community - but I don't think it really belongs in the lemoji folder in this repo, it's just too different.

So, I'm gonna add it to the community and then close this PR.

[gustavwilliam]

This should be good to go now. We decided in #branding that we want to have the emote on the repo, but that the lemoji folder wasn't a good fit. This is the main reason:

I consider each lemoji to be a distinct lemonhead, and that those lemonheads can be used as components to build lots of fun stuff, like the stuff we made for the welcome video. It's great that someone made a lemonsaurus, just don't mix it in with the actual lemojis. It's completely stylistically different and the lemon itself is tiny. Another folder would be fine.