updated docs

server/readme.md

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+# Server Code
+
+The server provides the API, serves static assets, and renders the pages for Send. The production entrypoint is [prod.js](./prod.js) and the development entrypoint is [dev.js](./dev.js) via `webpack-dev-server`.
+
+## Server configuration
+
+[config.js](./config.js) contains the schema for our configuration options. Environment variables are the preferred method for setting configuration.
+
+## Middleware
+
+Contains authentication and localization middleware.
+
+## Routes
+
+Contains all the server routes and handlers for the API and pages
+
+## Storage
+
+Contains implementations of possible storage engines for the files and metadata