Deprecate grid container helper classes

[oliverschuerch]

Deprecate some legacy grid-classes in styles/src/components/grid.scss and styles/src/layouts/portal/_grid.scss.

Tasks

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1. Deprecate .vertical-gutters (use gutter classes instead, e.g. .g-*, .gy-* or .gx-*)
2. Deprecate .row.border-gutters
3. Deprecate .container-reset
4. Deprecate .container-reset-left and .container-reset-right
5. Deprecate .container-fluid-#{$breakpoint}