Move inline React-CSS color styles to (s)css module file

[ekelen]

Get rid of all the style={{ color: theme.text.sectionText }} (for example) in our components. They are used almost everywhere and can replaced with a reference to one Sass module file.

The idea would be to import a global .module.scss file; declare const { name } = useContext(themeContext), then replace style={{...}} with className={...classNames, {...styles.light}} (pseudo-code) to element attributes.

Caveat, not worth it if it doesn't visibly reduce component complexity.

[moul]

moved to #2