Fix install assets.

[terabytesoftw]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[what-the-diff[bot]]

PR Summary

• Link Update - Bootstrap 5.2 in README We've added a reference to Bootstrap 5.2 in the project's README file, ensuring the latest resources are accessible in primary project documentation.

• Updated Installation Instructions for Assets in README The project README now features simplified instructions about how to install assets using AssetPackagist and npm-asset, enhancing the ease of project setup for new contributors or users.

• Cleaned up composer.json Unnecessary references, specifically to "npm-asset/bootstrap" and "composer-installers-extender," have been removed from the composer.json file, streamlining the project's dependencies.

• Condensed assets-setup.md Extensive instructions for installing assets which used asset-packagist, composer asset plugin, and Bower/NPM client have been removed from the assets-setup documentation. This condenses information, making it easier for users to follow.

• Instructions for using CDN Updated We have modernized the instructions for using CDN in the assets-setup page, providing up-to-date guidelines for getting CDN based resources.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7ba9222) 97.26% compared to head (e7d3f60) 97.26%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #121 +/- ## ========================================= Coverage 97.26% 97.26% Complexity 444 444 ========================================= Files 18 18 Lines 1570 1570 ========================================= Hits 1527 1527 Misses 43 43 ```

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