* - 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