docs: add install doc

docs/narr/install.rst

@@ -0,0 +1,70 @@
+
+==============
+ Installation
+==============
+
+
+Prerequisites
+-------------
+
+You'll need Python >= 3.8, and a database.  See also
+:doc:`wuttjamaican:narr/install/prereqs` in the Wutta docs.
+
+.. code-block:: sh
+
+   sudo apt install build-essential python3-dev python3-venv postgresql libpq-dev
+
+As for the database, see also :ref:`wuttjamaican:create-appdb` but FYI
+these docs will assume a PostgreSQL setup with ``sideshow`` as the DB
+name (and PG username).
+
+.. code-block:: sh
+
+   sudo -u postgres createuser sideshow
+   sudo -u postgres psql -c "ALTER USER sideshow PASSWORD 'mypassword'"
+   sudo -u postgres createdb -O sideshow sideshow
+
+
+Virtual Environment
+-------------------
+
+You should use a separate Python virtual environment for Sideshow.
+See also :doc:`wuttjamaican:narr/install/venv` but these docs will
+assume this exists at ``/srv/envs/sideshow``.
+
+Note that root privileges are required to create the folder, but then
+the folder ownership should be changed to whatever you need:
+
+.. code-block:: sh
+
+   cd /srv/envs
+   sudo mkdir -p sideshow
+   sudo chown myname:myname sideshow
+
+   python3 -m venv /srv/envs/sideshow
+   cd /srv/envs/sideshow
+   source bin/activate
+
+
+Install Sideshow
+----------------
+
+First install the Sideshow package to your virtual environment:
+
+.. code-block:: sh
+
+   cd /srv/envs/sideshow
+   bin/pip install Sideshow
+
+Then you can run the Sideshow installer:
+
+.. code-block:: sh
+
+   bin/sideshow install
+
+That will prompt you for DB connection info etc.  When finished you
+can run Sideshow:
+
+.. code-block:: sh
+
+   bin/wutta -c app/web.conf webapp