feat: added Composable Frontends product page

[Maciej D (mdanilowicz)]

This pull request adds a new overview page for Composable Frontends to the documentation. The new page introduces the product, explains its benefits, describes its architecture, and provides links to further resources for getting started.

Documentation additions:

• Added a new index.md file under products/composable-frontends that provides an overview of Composable Frontends, including its purpose, key features, architecture diagram, and links to official documentation and setup guides.

[Copilot]

Pull request overview

Adds a new product overview page for Composable Frontends, introducing its purpose, benefits, architecture, and links to the dedicated Frontends documentation.

Changes:

• Adds a new products/composable-frontends/index.md overview page.
• Adds a Composable Frontends logo SVG asset.
• References the existing architecture image and external getting-started resources.

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
products/composable-frontends/index.md	New documentation overview page for Composable Frontends.
assets/products-composableFrontends-logo.svg	New SVG logo used by the overview page.

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[Micha Hobert (Isengo1989)]

Bojan Rajh (@bojanrajh) shouldn't this be updated instead? https://github.com/shopware/developer-portal/blob/5d500d28b7c976f67d9c2f45f85b24276a7c7d21/src/storefront/index.md?plain=1#L7

Or is there some new logic with the new menu?

[Bojan Rajh (bojanrajh)]

Micha Hobert (@Isengo1989) Ideally, we would move that file into the frontends repo and remove the rewrite because the original rewrite is still available on the /frontends/overview.html.
We can also remove the landing page and rewrite to make the management more simple.