Add text and indicators on leaderboard

[SashaScholar6]

• [x] Show number of play attempts. in brackets (backend first)
• [x] Underneath 'Competitors' show purple star - 'Polymath', blue outline star - 'Stemmie', red outline star - ‘Humanitista’
• [x] move play button down so centred
• [x] make play button bigger on hover
• [x] add red help circle with hover popup: 'Competitors are ranked by brick plays first, then by their total scores. Multiple attempts (shown in brackets) are taken into account for prizes. Play 6 Humanities or 6 Stem bricks to start collecting stars.'

[ivanromakh]

@SashaScholar6 like this?

[SashaScholar6]

considerably smaller

[ivanromakh]

@SashaScholar6 where red circle should be? In the last point.

[SashaScholar6]

next to 'Competitors'