[Docs] Update install details and add more pages

docs/source/intro/01-install.md

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+# Installing Deluge
+
+These are the instructions for installer Deluge. They are a work-in-progress and feel
+free to make suggestions for improvement.
+
+## Ubuntu
+
+### PPA
+
+https://launchpad.net/~deluge-team/+archive/ubuntu/develop/
+
+### PyPi
+
+Deluge requires the following system installed packages:
+
+    sudo apt install python3-pip python3-libtorrent python3-gi python3-gi-cairo gir1.2-gtk-3.0 gir1.2-appindicator3
+
+Install with pip:
+
+    pip install --user deluge
+
+## Windows
+
+There is no installer package currently for Windows, but can try Deluge as follows.
+
+1. Install Python 3.6.
+2. Download and extract the `gvsbuild`.
+3. Open a terminal.
+4. Add directory to PATH: `set PATH=C:\gvsbuild\release;%PATH%`
+5. Install Python wheels from gvsbuild:
+   pip install C:\gvsbuild\release\python\pycairo-1.17.1-cp36-cp36m-win_amd64.whl
+   pip install C:\gvsbuild\release\python\PyGObject-3.28.3-py3.6-win-amd64.whl
+6. Install Deluge
+   pip install deluge deluge-libtorrent
+
+## macOS
+
+There is no `.app` package currently for macOS, but can try Deluge with homebrew.
+
+1. Install [Homebrew](https://brew.sh/)
+2. Open a terminal.
+3. Run the following to install required packages:
+
+   brew install pyobject3 gtk+3 adwaita-icon-theme
+   brew install libtorrent-rasterbar
+
+4. To fix translations:
+
+   brew link gettext --force
+
+5. Install Deluge:
+
+   pip3 install deluge

docs/source/intro/index.md

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+# Getting Started with Deluge
+
+This is a starting point if you are new to Deluge where we will walk
+you through getting up and running with our BitTorrent client.
+
+1. [Installing Deluge](01-install.md)
+2. Using Deluge
+3. Install a plugin