fix: rename directory, fix script and correct README.md

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

dev-reverse-proxy/.gitignore

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+# SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+#
+# SPDX-License-Identifier: CC0-1.0
+
+caddy

dev-reverse-proxy/Caddyfile

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+#
+# SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+#
+# SPDX-License-Identifier: AGPL-3.0-only
+#
+
+:8080
+
+log {
+	output stdout
+}
+
+reverse_proxy /realtime http://127.0.0.1:3000
+reverse_proxy /api/* http://127.0.0.1:3000
+reverse_proxy /public/* http://127.0.0.1:3000
+reverse_proxy /* http://127.0.0.1:3001

dev-reverse-proxy/README.md

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+<!--
+SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC-BY-SA-4.0
+-->
+
+To use backend and frontend together you need a reverse proxy that combines both services under one URL origin.
+
+We provide a ready to use config for caddy.
+Make sure that the backend is running on port 3000 with the env var HD_DOMAIN set to `http://localhost:8080` and the frontend is running on port 3001 with the env var HD_EDITOR_BASE_URL set to `http://localhost:8080/`.
+
+You can either use the script `run-caddy.sh` in this directory or download a caddy binary from [caddy](https://caddyserver.com/) and start it using `caddy run`.

dev-reverse-proxy/run-caddy.sh

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+#!/bin/bash
+#
+# SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+#
+# SPDX-License-Identifier: AGPL-3.0-only
+#
+
+set -e
+
+if [ ! -f caddy ]
+then
+curl -o caddy "https://caddyserver.com/api/download"
+chmod +x ./caddy
+fi
+
+exec ./caddy run