Refactor configuration management and enhance build process

- Introduced a YAML-based configuration system, allowing for automatic generation of a default `config.yaml` file.
- Updated the application to load configuration settings from the YAML file, improving flexibility and ease of use.
- Added a Makefile to streamline development tasks, including running the application, testing, and managing dependencies.
- Enhanced `.gitignore` to include build artifacts and configuration files.
- Removed unused Prometheus metrics and related code to simplify the codebase.
- Updated dependencies in `go.mod` and `go.sum` for improved functionality and performance.

.gitignore

@@ -1,5 +1,11 @@
-dist/
-tmp/
+#build artifacts
+/dist/
+
+#disk cache
+/disk/
+
+#config file
+/config.yaml
+
+#windows executables
 *.exe
-.smashed.txt
-.smashignore