refactor(docs): add direct migration link and ng add command

[geromegrignon]

Description

Related issues

Fixes #

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes the public API)
• Documentation only
• Refactor, test, or chore (no user-facing change)

Breaking changes

None

Test plan

• npm run build
• npm test
• npm run lint
• Verified in the demo app (if applicable)

Checklist

• Issue discussed or bug clearly described (link issue when applicable)
• Tests added or updated for behavioral changes
• Documentation updated (README, JSDoc, migration notes as needed)
• Public API changes documented; breaking changes called out
• CHANGELOG updated (if the repository maintains one and the change is user-facing)
• Commit messages follow Conventional Commits
• I agree to follow the OpenNG Foundation Code of Conduct

Additional context

[Copilot]

Pull request overview

Updates the docs landing page hero section to better direct new users by highlighting PrimeNG migration guidance and showing a one-click “ng add” install command.

Changes:

• Replaces the “Give a Star” GitHub CTA with a direct “Migrate from PrimeNG” link.
• Adds an ng add @openng/optimus-ui command pill with a copy-to-clipboard button.
• Implements clipboard copy behavior with visual “Copied!” feedback state.

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[Copilot]

Pull request overview

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

Suppressed comments (1)

apps/docs/pages/landing/herosection.component.ts:1047

• setTimeout(() => (this.commandCopied = false), 2000) can race if the user clicks the copy button multiple times: an earlier timeout may flip commandCopied back to false sooner than 2s after the most recent click. Track the timeout handle so you can clear/restart it on each successful copy (and clear it in ngOnDestroy).

            .then(() => {
                this.commandCopied = true;
                setTimeout(() => (this.commandCopied = false), 2000);
            })