add Webi installer, and Linux & Windows hints

src/docs/markdown/download.md

@@ -10,7 +10,7 @@ All our [official distributions](https://github.com/caddyserver/dist) come with
 
 ## Static binaries
 
-You can **[download Caddy from GitHub](https://github.com/caddyserver/caddy/releases)**, where new releases are immediately published.
+You can **[download Caddy from GitHub](https://github.com/caddyserver/caddy/releases)**, where new releases are immediately published, and place it in your PATH.
 
 Using `curl`:
 
@@ -31,6 +31,22 @@ Replace `ASSET` with the filename for your platform.
 [**View on Docker Hub**](https://hub.docker.com/_/caddy)
 
 
+## Linux & Raspberry Pi
+
+You can use Webi to automate the processes of downloading the latest release and putting it
+in your PATH, without requiring admin permissions.
+
+<pre><code class="cmd bash">curl -sS https://webinstall.dev/caddy | bash</code></pre>
+
+If you'd like a simple way to launch Caddy as a system service and bind to privilege ports,
+see the Webi [Caddy Cheat Sheet](https://webinstall.dev/caddy).
+
+To allow non-root users to bind to ports 80 and 443, use setcap.
+
+```
+sudo setcap cap_net_bind_service=+ep
+```
+
 ## Debian, Ubuntu, Raspbian
 
 <pre><code class="cmd"><span class="bash">echo "deb [trusted=yes] https://apt.fury.io/caddy/ /" \
@@ -65,6 +81,20 @@ RHEL/CentOS 7:
 
 ## macOS
 
+**Homebrew**
+
 <pre><code class="cmd bash">brew install caddy</code></pre>
 
 [**View the Homebrew formula**](https://formulae.brew.sh/formula/caddy)
+
+**Webi**
+
+<pre><code class="cmd bash">curl -sS https://webinstall.dev/caddy | bash</code></pre>
+
+[**View the Webi installer**](https://github.com/webinstall/webi-installers/tree/master/caddy)
+
+## Windows 10
+
+<pre><code class="cmd pwsh">curl.exe -A MS https://webinstall.dev/caddy | powershell</code></pre>
+
+You may need to adjust the Windows firewall rules to allow non-localhost incoming connections.