Docs and homepage should use the same style

[farodin91]

Both site have complete different color scheme and lot of things can be done to make both sites look more similar.

@porunov Should we do this on the homepage or on the documentation?

[porunov]

@farodin91 Can we make header less green in the docs?
Maybe it is only for me but I think it is too bright green colour. Maybe something like #75a477 or even different colour like #5b6773 or etc.
Then we can change colours on the main page to have a similar colour style. For example, if we change header in docs to #5b6773 then it will be easy to change header on the main page to the same #5b6773 colour and some backgrounds to some light grey colours like #f7f7f7 or similar.
It is just a quick suggestion but several people should look on different colour schemes and decide which one is the best because it is often hard to determine a good colour scheme by oneself.
Often the person who creates a colour scheme will like it and other may don't like it. So, we should experiment here.