Update Contacts page to mention silent payments, bolt-12, big-353 human readable addresses

[yashrajd]

Describe your content request

Update content and designs on this page to incorporate silent payments, bolt-12, big-353 human readable addresses.

Link to the page
https://bitcoin.design/guide/daily-spending-wallet/contacts/

Why would you like to change the content?
This page is more relevant than ever given recent developments mentioned above. The requested updates will make this useful page absolutely essential for Contacts-based payment apps.

Suggestions
see above

Additional context

silent payments, bolt-12, big-353 human readable addresses all introduce reusable payment info, which is ideal for Contacts.

Content guidelines
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[yashrajd]

• Add TOC (edit: it's already there but below the intro for some reason, needs to be moved up)
• Provide guidance for choosing payment method for a given contact (Contacts: Send request flow  #1036)
• Consider putting user verification (like PIN entry) in a box for easy visibility