Add "How can I override styles with higher specificity?" to FAQ

Since this question comes up almost every day in the main repo, we should add a FAQ entry to the website.

Based on this question and answer we should add a note about the &&& workaround and why it works to the FAQ.

[morajabi]

The ampersand solution is for overriding styles applied with former classNames or styled applied from the parent and some other cases. It’s not meant to be used for overriding inline styles.

/* css */
.header {
  background: #453434; /* overrided */
}

// JSX
<Div className="header sc-wS45d" />

const Div = styled.div`
  && {
    background: white; /* applied */
  }
`

[mxstbr]

You can use as many & as you want, the more you use the higher the specificity will be!