Update the website deploy step to trigger when using workflow_dispatch

[ruokun-niu]

Description

This pull request updates the deployment workflow for the website to allow deployments to be triggered both by a direct push to the main branch and manually via the "workflow_dispatch" event.

Workflow improvements:

• .github/workflows/website.yaml: Modified the deployment job condition to trigger on both push and workflow_dispatch events for the main branch.

Type of change

• This pull request fixes a bug in Drasi and has an approved issue (issue link required).
• This pull request adds or changes features of Drasi and has an approved issue (issue link required).
• This pull request is a minor refactor, code cleanup, test improvement, or other maintenance task and doesn't change the functionality of Drasi (issue link optional).

Fixes: #issue_number

[Copilot]

Pull request overview

Updates the GitHub Pages deployment workflow so the deploy job runs both on pushes to main and on manual workflow_dispatch runs (while still restricting deployment to the main ref).

Changes:

• Adjusted the deploy job if: condition to allow both push and workflow_dispatch events.
• Kept the deployment restricted to refs/heads/main to prevent deploying from non-main manual dispatches.

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