Add existing grid properties

[navix]

• grid
• grid-template
• grid-column-gap
• grid-row-gap
• grid-gap
• justify-items
• align-items: start | end | center | stretch;
• justify-content: start | end | center | stretch | space-around | space-between | space-evenly;
• align-content: start | end | center | stretch | space-around | space-between | space-evenly;
• grid-auto-columns
• grid-auto-rows
• grid-auto-flow
• justify-self
• align-self