ui: table - component style improvement

[catlabs]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[x] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/NationalBankBelgium/stark/blob/master/CONTRIBUTING.md#got-a-question-or-problem

Current behavior

The table has been done before the color and typo work.

Expected behavior

SCSS wise some improvements could be done, for instance the font size is too big.

[christophercr]

Closed in #746