Project structure refactor:

- Change package name general_server to gateway
- Changing the structure of directories and packages
- Adding vendor to the project

vendor/github.com/subosito/gotenv/.golangci.yaml

@@ -0,0 +1,7 @@
+# Options for analysis running.
+run:
+  timeout: 1m
+
+linters-settings:
+  gofmt:
+    simplify: true