Added Solarized Light theme

[AlessandroAnnini]

I used Visual Studio Code json

[lbogdan]

There was an issue with loading themes having comments, I fixed it in #972, and also added this theme there, you can test it here.
I added it to test that it works, if you really want to commit it let me know and I'll remove it from my PR.

[AlessandroAnnini]

Thanks @lbogdan
I think it works fine and it's reallly nice, let's do it

[lbogdan]

Closing this as it was added in #972 and deployed.