Try to improve README

README.md

@@ -1,7 +1,54 @@
 # manymanymany-varia-websites
 
-## Get Started
+> https://many.vvvvvvaria.org
+
+## Build the site locally
+
+### Get a local copy
 
 ```bash
 $ git clone https://git.vvvvvvaria.org/varia/manymanymany-varia-websites
 ```
+
+### Choose a version
+
+```bash
+$ cd manymanymany-varia-websites/3-column-plus
+```
+
+### System requirements
+
+Install the system requirements (on Debian based systems):
+
+```bash
+$ sudo apt install -y python3 python3-dev python3-venv
+```
+
+### Python requirements
+
+Then create a virtual environment and activate it:
+
+```bash
+$ python3 -m venv .venv
+$ source .venv/bin/activate
+```
+
+Then install the requirements:
+
+```bash
+$ pip install -r requirements.txt
+```
+
+### Generating the site
+
+Generate the content and run the server:
+
+```bash
+$ make devserver
+```
+
+Then the site is available at the following URL:
+
+> http://localhost:8000
+
+You can use `make help` for the other commands.