docs: add mkdocs, update links, add architecture documentation

docs/content/stories/phase4/4.1.2-initialize-gomod.md

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+# Task 4.1.2: Initialize `go.mod`:
+
+## Metadata
+- **Task ID**: 4.1.2
+- **Title**: Initialize `go.mod`:
+- **Phase**: 4 - Sample Feature Module (Blog)
+- **Section**: 4.1
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: TBD
+- **Dependencies**: TBD
+
+## Description
+Initialize `go.mod`:
+
+## Requirements
+- Initialize `go.mod`:
+
+## Implementation Steps
+1. TODO: Add implementation steps
+2. TODO: Add implementation steps
+3. TODO: Add implementation steps
+
+## Acceptance Criteria
+- [ ] Task 4.1.2 is completed
+- [ ] All requirements are met
+- [ ] Code compiles and tests pass
+
+## Related ADRs
+- See relevant ADRs in `docs/adr/`
+
+## Implementation Notes
+- TODO: Add implementation notes
+
+## Testing
+```bash
+# TODO: Add test commands
+go test ./...
+```
+
+
+## Code Reference
+
+```go
+cd modules/blog
+  go mod init github.com/yourorg/blog
+```