golinks

docs: Replace Redirector extension setup with browser keyword search instructions

chore: Add Makefile with common dev tasks and document in readme

feat: Add DecodeSlashes middleware to preserve encoded slashes in URL paths

feat: Refactor keyword and link controllers to improve routing and remove tag functionality; add comprehensive tests for keyword retrieval and view count increment.

feat: Add unit and integration tests for models and controllers, refine keyword validation, and update documentation.