Update External Apps, Expand IAX Information, Fix Broken Links

[jxmx]

This addresses:

• user-guide/externalapps/?h=iaxrpt#iaxrpt-pc-client: Fix or remove obsolete IAXRPT information #225 report of bad information
• Clarifies parts of the WebTransceiver protocol and fixes URI references
• Cleans up absolute references that throw warnings

Summary by CodeRabbit

• New Features

  • Added comprehensive guide for IAX Direct Authentication configuration

• Documentation

  • Restructured authentication methods documentation with clearer comparison tables
  • Added warning discouraging IAXRpt usage
  • Expanded Web Transceiver mechanism documentation
  • Fixed internal documentation links and cleaned up formatting

[jxmx]

@mkmer please review

[mkmer]

Looks good . Lot's to digest in there.

[coderabbitai]

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