Refactor installation instructions

(cherry picked from commit 2eb4589b0176b7377135c4539531abde7d0a88b4)

docs/start/development.md

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+---
+title: Development Server
+---
+
+## Development Server
+
+!!! warning "Installation"
+    Before continuing, ensure that the [installation steps](../install) have been completed.
+
+The following installation instructions can be used to launch a simple development server.
+
+!!! warning "Deployment"
+    Refer to the [deployment instructions](../deploy) to implement a much more robust server setup.
+
+### Running on a Local Machine
+
+To run the development server on a local machine, run the command:
+
+```
+(env) inv server
+```
+
+This will launch the InvenTree web interface at `http://127.0.0.1:8000`.
+
+A different port can be specified using the `-a` flag:
+
+```
+(env) inv server -a 127.0.0.1:8123
+```
+
+Serving on the address `127.0.0.1` means that InvenTree will only be available *on that computer*. The server will be accessible from a web browser on the same computer, but not from any other computers on the local network.
+
+### Running on a Local Network
+
+To enable access to the InvenTree server from other computers on a local network, you need to know the IP of the computer running the server. For example, if the server IP address is `192.168.120.1`:
+
+```
+(env) inv server -a 192.168.120.1:8000
+```
+
+## Background Worker
+
+The backgroun task manager must also be started. The InvenTree server is already running in the foreground, so open a *new shell window* to start the server.
+
+### Activate Virtual Environment
+
+```
+cd /home/inventree
+source ./env/bin/activate
+```
+
+### Start Background Worker
+
+```
+(env) invoke worker
+```
+
+This will start the background process manager in the current shell.