docs: add mkdocs, update links, add architecture documentation

docs/content/adr/0001-go-module-path.md

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+# ADR-0001: Go Module Path
+
+## Status
+Accepted
+
+## Context
+The project needs a Go module path that uniquely identifies the platform. This path will be used:
+- In `go.mod` file
+- For importing packages within the project
+- For module dependencies
+- For future module publishing
+
+## Decision
+Use `git.dcentral.systems/toolz/goplt` as the Go module path.
+
+**Rationale:**
+- Matches the organization's Git hosting structure
+- Follows Go module naming conventions
+- Clearly identifies the project as a Go platform tool
+- Prevents naming conflicts with other modules
+
+## Consequences
+
+### Positive
+- Clear, descriptive module path
+- Aligns with organization's infrastructure
+- Easy to identify in dependency graphs
+
+### Negative
+- Requires access to `git.dcentral.systems` for module resolution
+- May need to configure GOPRIVATE/GONOPROXY if using private registry
+
+### Implementation Notes
+- Initialize module: `go mod init git.dcentral.systems/toolz/goplt`
+- Update all import paths in code to use this module path
+- Configure `.git/config` or Go environment variables if needed for private module access
+