New design for the storefront!

[aleph1ow]

Update the storefront to match the design currently available on the Solidus demo!

https://github.com/solidusio/solidus_starter_frontend/assets/167946/cdd3b548-c40a-4ed5-ad0d-c2e8538888af

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• [ ] I have written a thorough PR description.
• [ ] I have kept my commits small and atomic.
• [ ] I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov[bot]]

Codecov Report

Attention: 109 lines in your changes are missing coverage. Please review.

Comparison is base (e688d59) 97.33% compared to head (aedcb90) 95.98%. Report is 4 commits behind head on main.

Files	Patch %	Lines
...idus_paypal_commerce_platform/orders_controller.rb	34.28%	23 Missing :warning:
templates/app/views/users/show.html.erb	35.29%	22 Missing :warning:
...us_paypal_commerce_platform/payments_controller.rb	38.09%	13 Missing :warning:
...pal_commerce_platform/shipping_rates_controller.rb	41.17%	10 Missing :warning:
...idus_paypal_commerce_platform/wizard_controller.rb	46.66%	8 Missing :warning:
templates/app/views/orders/_line_items.html.erb	69.23%	8 Missing :warning:
...es/app/views/products/_product_thumbnails.html.erb	64.70%	6 Missing :warning:
templates/app/components/taxons_tree_component.rb	76.47%	4 Missing :warning:
...ypal_commerce_platform/paypal_orders_controller.rb	63.63%	4 Missing :warning:
templates/spec/system/cart_spec.rb	73.33%	4 Missing :warning:
... and 6 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #356 +/- ## ========================================== - Coverage 97.33% 95.98% -1.36% ========================================== Files 188 208 +20 Lines 4548 4854 +306 ========================================== + Hits 4427 4659 +232 - Misses 121 195 +74 ```

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