[docs] Example issue directly and send

[tmarkovski]

PR-Codex overview

This PR adds new examples for issuing and exchanging credentials, and includes a detailed guide for issuing credentials directly and sending them to the user's wallet by specifying an email address.

Detailed summary

• Added examples for issuing credentials directly and exchanging using CHAPI
• Added example for issuing credentials interactively and delivering out-of-band
• Added examples for verifying credentials using OIDC and CHAPI
• Added example for identity verification using document and biometrics
• Added detailed guide for issuing credentials directly and sending them to the user's wallet

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[github-actions]

Preview docs site for tm/example-issue-send@c605e18a
Changed paths:

1. docs/examples/1-issue-direct-send.md
2. docs/examples/index.md