Change: Update README and add livehtml

Improve the installation procedures in the README and add a section
about running a auto-rebuild web server.

README.md

@@ -5,15 +5,25 @@
 The documentation is build automatically via GitHub Actions and available at
 https://greenbone.github.io/docs/
 
-For a manual build locally [poetry](https://python-poetry.org/) is required.
+## Requirements
 
-First install poetry and the project dependencies with
+For a manual build locally Python >= 3.9 and [poetry] is required.
+
+## Install Dependencies
+
+To install poetry it is recommended to use [pipx]
+```sh
+python3 -m pipx install poetry
+```
+
+To install the project dependencies via [poetry] run
 ```sh
-python3 -m pip install poetry
 poetry install
 ```
 
-Afterwards the docs can be build with
+## Manual Build
+
+After installing [poetry] and the project's dependencies, the docs can be build with
 ```sh
 poetry run make html
 ```
@@ -23,3 +33,21 @@ To open the generated HTML docs with Firefox you can run
 ```sh
 firefox _build/html/index.html
 ```
+
+## Auto Rebuild
+
+Alternatively it is possible to start a local HTTP server that automatically
+rebuilds the docs on every file change
+
+```sh
+poetry run make livehtml
+```
+
+To open the served docs with Firefox you can run
+
+```sh
+firefox http://127.0.0.1:8000
+```
+
+[poetry]: https://python-poetry.org/
+[pipx]: https://pipx.pypa.io/stable/