fix: ssr context from cookies

[patzick]

Description

closes #150

• fixed problem with context on SSR reload
• improved performance of initial page load from demo store, as context no longer needs to reload before wishlist
• lighthouse score should go up as we're having less reqyests

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Screenshots (if applicable)

Not logged-in customer at homepage

Before:

After:

Logged in customer at homepage

Before:

After:

Additional context

I had a lot of items in wishlist so added clearWishlist button

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontends-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 11:40am
shopware-frontends-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 11:40am