nicer formating of grid-template-areas

[jogibear9988]

Expected Behaviour

template areas should be stringified like this:

grid-template-areas: "menu head head head"
                     "menu main main main"
                     "menu main main main"
                     "menu footer footer footer";

Actual Behaviour

grid-template-areas: "menu head head head"
"menu main main main"
"menu main main main"
"menu footer footer footer";

[holblin]

Yes it could be good, though I'm not sure of the priority for this work.
I mainly try to remove security issue and maintain the package but I have no time to improve it.
Feel free to make a PR with that changes and add associated test though, I would be happy to review and merge it.