fix: Update nginx config to use dynamic DNS resolution

- Replace upstream blocks with resolver directive
- Use variables for backend addresses to avoid startup errors
- Simplify configuration with single server block
- Add health check endpoint

server/api/node_modules/@sinonjs/commons/README.md

@@ -0,0 +1,16 @@
+# commons
+
+[![CircleCI](https://circleci.com/gh/sinonjs/commons.svg?style=svg)](https://circleci.com/gh/sinonjs/commons)
+[![codecov](https://codecov.io/gh/sinonjs/commons/branch/master/graph/badge.svg)](https://codecov.io/gh/sinonjs/commons)
+<a href="CODE_OF_CONDUCT.md"><img src="https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg" alt="Contributor Covenant" /></a>
+
+Simple functions shared among the sinon end user libraries
+
+## Rules
+
+-   Follows the [Sinon.JS compatibility](https://github.com/sinonjs/sinon/blob/master/CONTRIBUTING.md#compatibility)
+-   100% test coverage
+-   Code formatted using [Prettier](https://prettier.io)
+-   No side effects welcome! (only pure functions)
+-   No platform specific functions
+-   One export per file (any bundler can do tree shaking)