fix: restore user-facing AmberCLI documentation while hiding internals

- Remove :nodoc: from main AmberCLI module to restore Commands and Documentation
- Keep all internal modules hidden (Core, Vendor, Exceptions, MainCommand)
- Result: Clean documentation with only user-facing content

Final structure:
- AmberCLI::Commands::* (8 commands with examples)
- AmberCLI::Documentation::* (10 comprehensive guides)
- 23 total HTML files (72% reduction from original 84)
- Zero internal implementation details exposed
- Rich command documentation with usage examples
- Complete guides for all CLI functionality including framework version config

Author: crimson-knight

docs/README.md

@@ -1,7 +1,6 @@
 # :nodoc:
 require "./core/base_command"
 
-# :nodoc:
 module AmberCLI
   class MainCommand < AmberCLI::Core::BaseCommand
     def initialize