Adopting Design from grin.ninja

[i1skn]

This PR implements a design from grin.ninja - https://hq.grin.ninja/ as a Jekyll theme.
Caveats:

• Not a whole lot is now can be configurable from *.yml files. I decided that we can go incrementally on this.
• On pages, like learn and funding "Home" link would appear and would lead to /. It means that it would work on example.com, but not on example.com/super-site/. Not sure how to fix it for now.

The preview of the website is here: https://i1skn.github.io/site-test/.
Although, only differences from the https://hq.grin.ninja/ are:

• https://i1skn.github.io/site-test/learn
• https://i1skn.github.io/site-test/funding

[ignopeverell]

@i1skn this is great! I agree on making this a little more incremental. Would you prefer leaving this PR open for these improvements and potential @JollyGrin design improvements as well or do you prefer progressing with additional PRs?

[i1skn]

I think it's better to proceed with additional PRs:

• People would see the text they editing right on the new design.
• Bugs/missing features would be found faster because more users would see/play with it.

@ignopeverell @JollyGrin What do you think?

[ignopeverell]

Merged!

[JollyGrin]

Sounds good to me! I'll continue making any design improvements on hq.grin.ninja for simplicity sake, but as you said could me added with additional pull requests :)