* - Refactor several API routes from anonymous functions to regular definitions. Required to add parseable documentation comments.
- Add API documentation comments using Swag Declarative Comments Format
- Add echo-swagger to serve Swagger-UI at /api/index.html
- Fix error response from extraneous parameter resourceId to relatedMemoId in DELETE("/memo/:memoId/relation/:relatedMemoId/type/:relationType")
- Add an auto-generated ./docs/api/v1.md for quick reference on repo (generated by swagger-markdown)
- Add auxiliary scripts to generate docs.go and swagger.yaml
* fix: golangci-lint errors
* fix: go fmt flag in swag scripts
