Update website for public beta, add Google Play button

Content changes look good. Now, there's merge conflicts. Let me know when they are resolved and I test the style changes locally as well.

added 6 commits

• 3d169f99...5a92a8d3 - 3 commits from branch master
• 8bba0bfc - Moved inactive contributors to the bottom of the about page.
• d95fdaff - Updated website for public beta, added Google Play button.
• 9b9f78fa - Added blogs to how it works page.

Compare with previous version

Rebased.

merged

mentioned in commit 43ed2f12