set up horizontalsystems.io website

[esengulov]

• [x] prepare draft version for text and layout for the site
• [x] setup and host the website on Github Pages
• [x] design and apply some decent theme

[esengulov]

@tmedetbekov @TalgatNurdinov my part is ready, please work on the theme/layout

we have 4 pages:

• index.md (home)
• hs-dapps.md
• hs-team.md
• hs-invest.md

[esengulov]

https://horizontalsystems.io/