Improve favicon look&feel and site bookmarking
Add support for bets. Logged in users can bet on champion.

Placed bets are visible by everyone.
Sign in strategy will be added later.
Fix syntax.
Add user register, and OAuth2 signin with google

Non-backward changes:
- DB user has 2 additional fields: type (=native for site users) and name (optional)
- env/config.json (sensitive data) needs google authentication data
Both should be pushed to production before code load (update data first, then code).
Release version v0.8.0