feat(default-theme): handle product-three-column, text-three-column a…

[mkucmus]

…nd text-two-column block types

Changes

closes #966

implemented cms blocks:

• text three columns
• text two columns
• product three columns

Checklist

• I followed contributing guidelines

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💙 shopware-pwa-canary successfully deployed at https://2a869ee264a1a4d65b811c21d820f1588bb63b77.shopware-pwa-canary.preview.storefrontcloud.io

[akrajna]

text three columns and text two columns:
on mobiles with small resolution as iPhone 6S, the spaces between each text section is too narrow:

also the part of the text at very bottom is hiding partly under the component below:

or overlaying the component, as below:

[akrajna]

product three columns:

• the description under product pictures overlays content below
• the product pictures have different sizing

- on mobile the price of one product is cut