Merge branch 'lars-debian-deployment' into 'master'

docs: use local Debian packages for bare-metal deployment

See merge request aura/engine!6

docs/bare-metal-installation.md

@@ -24,9 +24,7 @@ Aura Engine runs on any modern Debian-based OS. It requires at least
 - [Python 3.8+](https://www.python.org/downloads/release/python-380/)
 - [`pip`](https://pip.pypa.io/en/stable/)
 - [`git`](https://git-scm.com/)
-- 'python3.8-venv' or [`virtualenv`](https://pypi.org/project/virtualenv/)
-- `python3-wheel`
-- [PostgreSQL 12+](https://www.postgresql.org/)
+- [PostgreSQL 13+](https://www.postgresql.org/)
 
 
 **Setting up the project structure**
@@ -46,24 +44,16 @@ If you are developing engine you also might want the projects `steering`, `dashb
 
 ## Preparation
 
-In case of an development environment, create a virtual environment for your Python dependencies:
-
-```shell
-python3.8 -m venv python
-```
-
-No worries, the resulting `python` directory is excluded from the git respostory.
-
-To activate that environment, run
-
-```shell
-source python/bin/activate
-```
-
-Then, install the required dependencies
-
+Install dependencies:
 ```shell
-pip install -r requirements.txt
+apt install \
+    python3-flask \
+    python3-flask-sqlalchemy \
+    python3-http-parser \
+    python3-psycopg2 \
+    python3-requests \
+    python3-sqlalchemy \
+    python3-validators
 ```
 
 Create your base configuration from the sample configuration
@@ -80,8 +70,6 @@ cp config/sample-production.engine.ini config/engine.ini
 Engine requires a PorstgreSQL database to cache any programme info locally:
 
 ```bash
-# Additional Python packages for PostgreSQL
-pip3 install -r contrib/postgresql-requirements.txt
 # Create database and user (change password in script)
 sudo -u postgres psql -f contrib/postgresql-create-database.sql
 ```
@@ -106,13 +94,7 @@ Required modifications are:
 
 ## Running Engine
 
-If you have defined a virtual env during the installation step you'll need to activate it first. You'll have to do so whenever you gonna start your development environment:
-
-```shell
-source python/bin/activate
-```
-
-There's a convenience script `run.sh` to get Engine components started.
+There's a convencience script `run.sh` to get engine started
 
 ```shell
 engine$ ./run.sh