Fix non-Angular content generated in Angular documentation

[viktorkombov]

Description

While verifying the Angular documentation staging build, two pre-existing content issues were found where non-Angular content is still generated as part of the Angular site.

1. geo-map-binding-multiple-shapes.mdx

The Angular page renders React Igr* and Web Components Igc* code snippets.

Several platform-specific implementations are currently grouped inside the same:

<PlatformBlock for="Angular, React, WebComponents">

As a result, snippets intended for React and Web Components are also rendered on the Angular version of the topic.

The platform-specific examples should be separated so that the Angular page contains only Angular code.

2. nuget-feed.mdx

nuget-feed.mdx describes installing Ignite UI for Blazor NuGet packages.

The topic is not linked from the Angular sidebar/TOC, but the Angular build still:

• generates the public /nuget-feed route;
• includes the route in the Angular sitemap.

The topic should either be scoped to the appropriate platform or excluded from the Angular build.

Expected result

Angular documentation builds should contain only Angular-relevant topics and code samples.

Additional context

These issues were discovered while verifying the Angular staging build. They are pre-existing and unrelated to the PR under test.