Add OS descriptions

Author: dreamer

content/downloads/devel/index.md

@@ -3,14 +3,57 @@ title = "Development builds"
 template = "devel-builds.html"
 +++
 
-## Linux
+## Installation notes
 
-TODO: list dependencies
+Development snapshot builds do not touch configuration of stable
+version; they use separate config file (`dosbox-staging-git.conf`)
+located in:
 
-## Windows
+<table>
+  <tr>
+    <td>Linux</td>
+    <td><code>~/.config/dosbox/</code></td>
+  </tr>
+  <tr>
+    <td>Windows</td>
+    <td><code>C:\Users\USERNAME\AppData\Local\DOSBox\</code></td>
+  </tr>
+  <tr>
+    <td>macOS</td>
+    <td><code>~/Library/Preferences/DOSBox/</code></td>
+  </tr>
+</table>
 
-TODO: link to info
 
-## macOS
+### Linux
 
-TODO: link to info
+These are dynamically-linked x86\_64 builds, you'll need additional packages installed via your package manager.
+
+#### Fedora
+
+    sudo dnf install SDL2 SDL2_net opusfile
+
+#### Debian, Ubuntu
+
+    sudo apt install libsdl2-2.0-0 libsdl2-net-2.0-0 libopusfile0
+
+#### Arch, Manjaro
+
+    sudo pacman -S sdl2 sdl2_net opusfile
+
+
+### Windows
+
+Windows executables in a snapshot packages are not signed, therefore Windows 10
+might prevent the program from starting.
+
+See [this guide](/downloads/windows/#ms-ss) to learn how to deal with this.
+
+
+### macOS
+
+macOS bundle is notarized via Apple Gatekeeper, your OS will try to prevent
+dosbox-staging from running.
+
+See [this guide](/downloads/macos/#apple-gatekeeper) to learn how to deal with
+this.

templates/devel-builds.html

@@ -81,7 +81,15 @@
     <h1 class="post-title">{{ page.title }}</h1>
 
     <p>
-        <em>Development build artifacts are hosted on GitHub; you need to be logged in to download them.</em>
+        These are unstable development snapshots intended for testing and
+	showcasing new features; if you want to download a stable build,
+	head on to <a href="/downloads/linux/">Linux</a>,
+	<a href="/downloads/windows/">Windows</a>, or
+	<a href="/downloads/macos/">macOS</a> download pages.
+    </p>
+
+    <p>
+        <em>Build artifacts are hosted on GitHub; you need to be logged in to download them.</em>
     </p>
 
     <table>