chore: add dev install isntructions to docs

docs/source/installation.rst

@@ -1,8 +1,8 @@
 Installation
 ==================
 
-Dependencies
-----------------------
+Basic runtime dependencies
+---------------------------------
 
 If not already installed, the below can be found in your system’s package manager.
 
@@ -10,7 +10,6 @@ If any dependencies are missing when the application starts, it will warn you, s
 
 - curl
 - jq
-- PyGObject (python-gobject)
 - steam
 - wmctrl or xdotool
 - zenity
@@ -18,43 +17,90 @@ If any dependencies are missing when the application starts, it will warn you, s
 .. note::
     All dependencies are installed out of the box on Steam Deck.
 
-Downloading
-------------------
+UI dependencies (Python and PyGObject)
+---------------------------------------
+.. important::
+    As of version 6.0.0, you must have a valid Python 3.13 and matching PyGObject environment.
+    Depending on your distribution, this may require additional manual intervention.
 
-Automatic installation
+Arch Linux (vanilla variants)
+^^^^^^^^^^^^^^^^^^^^^^
+You will need the ``python3.13`` package, if it is not already installed.
+
+Install the following build dependencies:
+
+.. code:: console
+
+   sudo pacman -S cmake gcc pkgconf python-cairo
+
+.. include:: venv.rst
+
+CachyOS (Arch)
 ^^^^^^^^^^^^^^^^^^^^^^^
-Invoke the command below from a terminal:
+Refer to the build instructions for Arch Linux first.
+The ``python3.13`` package is not available on CachyOS, so it is recommended to
+use ``uv`` to manage Python versions.
+
+.. code:: console
+
+   sudo pacman -S uv
+
+.. include:: venv.rst
+
+Manjaro 26 (Arch)
+^^^^^^^^^^^^^^^^^^^^^^^
+If Python 3.13 is not already available out of the box, refer to the build instructions for :ref:`Arch Linux (vanilla variants)`.
+
+Debian 13 variants
+^^^^^^^^^^^^^^^^^^^^^^^
+Python 3.13 and PyGObject are available out of the box. No additional steps are necessary.
+You can proceed to the :ref:`Installscript`.
+
+Fedora 43 variants
+^^^^^^^^^^^^^^^^^^^^^^^
+Fedora 43 ships with a newer version of Python (3.14), so you must set up Python 3.13 in its own
+virtual environment (venv) to prevent it from conflicting with the system package.
+
+Install the following build dependencies:
+
+.. code:: console
+
+    sudo dnf install cairo cairo-devel cairo-gobject-devel gcc python3.13 python3.13-devel
+
+.. include:: venv.rst
+
+Ubuntu 24 variants
+^^^^^^^^^^^^^^^^^^^^^^
+Ubuntu ships with an older version of Python (3.12). You must install additional dependencies.
+Add the PPA below to add Python 3.13 to your sources:
+
+.. code:: console
+
+    sudo add-apt-repository ppa:deadsnakes/ppa
+
+Install the following build dependencies:
+
+.. code:: console
+
+    sudo apt install python3.13 python3.13-venv python3.13-dev build-essential python3-gi-cairo pkg-config libgirepository-2.0-dev libcairo2-dev
+
+.. include:: venv.rst
+
+Installscript
+-----------------------
+
+Invoke the command below from a terminal. This script fetches the main DZGUI script from the repository,
+makes it executable, and launches DZGUI's first-time setup. After running this installscript, you will
+have the file ``dzgui.sh`` wherever you invoked the command.
 
 .. code:: console
 
     curl -s "https://codeberg.org/aclist/dztui/raw/branch/dzgui/install.sh" | bash
 
-
-Manual installation
-^^^^^^^^^^^^^^^^^^^^
-
-Clone the repository:
-
-.. code:: console
-
-    git clone https://codeberg.org/aclist/dztui.git
-
-Set the executable bit on ``dzgui.sh``:
-
-.. code:: console
-
-    chmod +x dzgui.sh
-
-
-Launch the script:
-
-.. code:: console
-
-    ./dzgui.sh
-
 nixOS installation
-^^^^^^^^^^^^^^^^^^^
-Two packages are independently maintained by other contributors. Each takes a slightly different approach:
+----------------------
+Two packages are independently maintained by other contributors. Each takes a slightly different approach.
+nixOS packages are standalone and do not require cloning the git repository.
 
 - https://github.com/lelgenio/dzgui-nix
 - https://github.com/jiriks74/dzgui.flake