docs(www): add code tabs and copy functionality

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #4877

There's currently no implementation for code tabs.

What is the new behavior?

This PR implements a code tabs component, and updates the content to use the new component.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Some notes:

• Styling is not my strongest point, Copilot helped me a hand here
• I added a copy functionality because I find it easier to copy paste code from the docs
• Because the current state of the docs don't have a tabs component with content, here are some screenshots to show it in action.

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[timdeschryver]

Maybe not the best implementation, but it works.
The idea is to reuse the ngrx-code-example in the content, and re-render it here using it's own rendered HTML.
The ngrx-code-example is re-used here to have the copy functionality.