Mini season graphs for stats

[briankoser]

• [x] Seasons - Stacked bars for essential, listen, skip
• [x] Recurring segments - 1 bar per season

[briankoser]

<svg height="50" width="100">
    <g>
        <rect x="2" y="15" width="16" fill="rgba(85,25,215, .8)" height="35">7</rect>
        <text x="5" y="46" font-family="monospace" font-size="18" fill="white">1</text>

        <rect x="18" y="0" width="16" fill="rgba(85,25,215, .8)" height="50">10</rect>
        <text x="20" y="46" font-family="monospace" font-size="18" fill="white">2</text>

        <rect x="34" y="40" width="16" fill="rgba(85,25,215, .8)" height="10">2</rect>
        <text x="36" y="46" font-family="monospace" font-size="18" fill="white">3</text>
    </g>
</svg>