PDP improvements

[riczi-ricz]

1. Add swatch variant selector,

2. if a product class has more than two attributes, like trousers, we should concatenate them to one size value ex.: waist 32, and length 34 should be indexed as 32-34.

3. Non-variant attributes (description, Size & Fit, Materian & Care) shown as Accordion

4. Free shipping is shown as Alert

5. Description of the product panel (right side) is fixed until it reaches the footer or is bigger than the viewport

6. When I change an attribute color I want the photos assigned to this attribute to be automatically displayed