Should enable autoprefixer for grid

[HristoP96]

Description

The igx-grid width issues in IE11 are caused due to lack of prefixed styles, necessary for the browser to render the igx-grid component. In Angular this work is done by the Autoprefixer plugin. The thing about it is that the grid feature (which prefixes all the styles including grid selectors) is no longer implicitly available (This PR explains, why such default behavior should be omitted) and it should be enabled so that the igx-grid could be compatible with the IE11 browser.

Here is a reference to the issue logged in Angular CLI, in which is explained how to enable the autoprefixer to operate over grids.

In addition:

Enabling the autoprefixer for grid will resolve the following issues:

• Grid rendering issue under IE 11

• IgxGrid rendering issues onIE

• The Display Density sample does not render the horizontal and vertical scrollbars in IE11

• Grids with width in % in IE are broken

• igxGrids are not displayed properly in the JP sample page

[HristoP96]

A decision was made that this configuration will not be applied in the product, but it will be documented.

This is the pull request, regarding the documentation that describes how and why the customer should enable the autoprefixer for grid layouts.