Welcome Dashboard Title styling on markdown files

[ricardobaeta]

I've just noticed that the Title on the Welcome Dashboard is not using Source Sans Pro, according to the new Typography PR.

On the welcome dashboard markdown files we have:

.dashboard-markdown .dashboard-component.dashboard-component-chart-holder h1 {
    margin-top: 24px;
    margin-bottom: 24px;
    line-height: 1.6;
    font-size: 30px;
    font-weight: bold;
}

And we just need to add:

font-family: Source Sans Pro, Helvetica Neue, Arial, sans-serif;

Before:

After: