[Performance] Lazy loading of most top routes

[bobbykolev]

This PR aims to speed up the Homepage (not only).

With the simple change of loading dynamically all top-level routes, now the main bundle size is significantly reduced (~40%):

@SimoneZaza approved the changes, but we could revert some of the dynamic imports (the space one) in the future.

In this PR the following page was deleted:
https://alkem.io/about

Summary by CodeRabbit

• New Features

  • Introduced lazy loading for various routes, enhancing performance and user experience by reducing initial load times.

• Bug Fixes

  • Removed the About page, streamlining the application interface.

• Refactor

  • Changed export statements for multiple components from named to default exports, improving import consistency.

• Chores

  • Updated routing structure to include Suspense for better loading state management.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The pull request includes modifications to several components related to routing in a React application. Key changes involve altering export statements from named exports to default exports for the SpaceRoute, AdminRoute, and SpaceExplorerPage components. Additionally, the TopLevelRoutes component has been updated to implement lazy loading for various routes, improving the loading experience. The AboutPage component has been removed entirely, streamlining the routing structure.

Changes

File Path	Change Summary
src/domain/journey/space/routing/SpaceRoute.tsx	Changed export from named to default for SpaceRoute.
src/domain/platform/admin/routing/AdminRoute.tsx	Changed export from named to default for AdminRoute.
src/main/routing/TopLevelRoutes.tsx	Updated to use lazy loading for multiple routes and changed component signature from FC to function. Removed AboutPage import.
src/main/topLevelPages/About.tsx	Removed the AboutPage component entirely.
src/main/topLevelPages/topLevelSpaces/SpaceExplorerPage.tsx	Changed export from named to default for SpaceExplorerPage.

Possibly related PRs

• New Explore view for unauthenticated users #6945: The changes in this PR involve modifying the export statement of the JourneyTile component, which is related to the SpaceRoute component's export changes in the main PR.
• [Simple Homepage] Explore spaces  #7097: This PR introduces a new columns prop to the JourneyTile component, which is relevant to the changes made in the SpaceRoute component as both are part of the journey and space exploration features.

Suggested labels

client

Suggested reviewers

• bobbykolev

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