feat: upload module (#486)

* feat: wip upload module

* feat: local storage and serve local images

* feat: protect against injections

* feat: server local and s3 files

* fix: use storage location when serving local files

* feat: cross field env validation

server/.gitignore

@@ -32,4 +32,7 @@ lerna-debug.log*
 !.vscode/settings.json
 !.vscode/inbox.json
 !.vscode/launch.json
-!.vscode/extensions.json
+!.vscode/extensions.json
+
+# Local storage
+.local-storage