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/@kwsites/file-exists/CHANGELOG.md

@@ -0,0 +1,12 @@
+
+# Release History
+
+## 1.1.1
+
+- Add dependency on `debug` to log results of the file system checks
+- Add `jest` tests
+
+# 1.0.0
+
+- First public release, a simple typescript library for checking whether a path exists
+  on the file system and optionally whether it points to a file or folder.