[Docs] Refactoring the PATH Developer Guide docs

[Olshansk]

Summary

Restructure config management and documentation for better organization and clarity

Primary Changes:

• Reorganize config management by splitting into protocol-specific Makefiles (morse_configs.mk, shannon_configs.mk)
• Set lazy_mode=true by default in Shannon protocol because it lost support in [Protocol] Correct the scope of onchain app queries made by Shannon protocol instance #140
• Reorganize documentation structure with dedicated guides for Morse and Shannon protocols

Secondary changes:

• Remove usage of ./bin/config/.config.yaml and bias to ./local/path/config/.config.yaml everywhere
• Improve error messages and config validation in Makefiles
• Update config file copy/preparation commands for better usability
• Move test, docs and envoy targets into separate Makefiles for better organization

Type of change

Select one or more from the following:

• New feature, functionality or library
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Testing

• All Tests: make test_all
  • make test_e2e_shannon_relay
  • make test_e2e_morse_relay
  • Manual curl:

     curl http://localhost:3070/v1/endpoint_1_static_key \
         -X POST \
         -H "authorization: api_key_1" \
         -H "target-service-id: anvil" \
         -d '{"jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber" }'

• Documentation: make docusaurus_start; only needed if you make doc changes

Sanity Checklist

• I have tested my changes using the available tooling
• I have commented my code
• I have performed a self-review of my own code; both comments & source code
• I create and reference any new tickets, if applicable
• I have left TODOs throughout the codebase, if applicable

[Olshansk]

@adshmh @commoddity PTAL a detail look.

Need a close set of 👀 and 👐 on this one as I touched/refactored a lot of this on the developer experience front.

[commoddity]

Great PR. Loving the way the docs are taking shape here; the splitting apart of some of the bigger pages into different sections makes a world of difference in reducing the mental overload. Ditto for the Makefiles.

Just a few comments and notes but definitely like what this is doing to the docs.

[Olshansk]

@commoddity I'm still testing + updating the PR but most of the comments you left should be addressed here: 781bcab (#137)

[Olshansk]

@commoddity PTAL again when you can!

[commoddity]

LGTM, thanks for the changes.