feature: Email Link and Phone Link (in Action Block)

[jbmoelker]

Important

Depends on #234, which should be merged first.

Changes

• Adds Email Link to easily send an email (with optional subject and body text).
• Adds Phone Link to easily start phone call, send sms (with optional text) or contact via WhatsApp (with optional message).

Associated issue

N/A

How to test

1. Open preview link
2. Navigate to Action Block demo > "Action block with Email Links" section
3. Verify all variations (mailto only, with subject, with subject + body) work
4. Navigate to Action Block demo > "Action block with Phone Links" section
5. Verify all variations (call, sms, whatsapp) work (best to check on both Android and iOS)
6. Go the the email-and-phone-links environment and play around with the new Email Link and Phone Link option in Action Blocks
7. Verify changes made are reflected in the web page (note: run locally as changes are not updated on deploy preview)

Checklist

• I have performed a self-review of my own code
• I have made sure that my PR is easy to review (not too big, includes comments)
• I have made updated relevant documentation files (in project README, docs/, etc)
• I have added a decision log entry if the change affects the architecture or changes a significant technology
• I have notified a reviewer

[cloudflare-workers-and-pages]

Deploying head-start with    Cloudflare Pages

Latest commit:	eeb8b8f
Status:	✅  Deploy successful!
Preview URL:	https://da44dd74.head-start.pages.dev
Branch Preview URL:	https://feat-email-and-phone-links.head-start.pages.dev

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