Add field_ref macro to create a clickable reference to a proto field

[geel9]

• Adds field_ref macro
  • Creates a clickable reference to a proto field in a request/response object
    • Clicking the reference will display the referenced field, briefly highlight it, and scroll the page to bring it into view
• Uses field_ref macro wherever fields are currently referenced in the Reference section of our docs

[github-actions]

Preview docs site for JC/connect-docs-fix@191d9aff
Changed paths:

1. docs/reference/proto/index.md
2. docs/reference/services/connect-service.md
3. docs/reference/services/credential-service.md
4. docs/reference/services/file-management-service.md
5. docs/reference/services/provider-service.md
6. docs/reference/services/template-service.md
7. docs/reference/services/wallet-service.md