feat: implement the caddy plugin

This plugin uses a docker-compose based Caddy installation in conjunction with injected container labels to route requests. It only exposes the minimal necessary for routing traffic to docker containers. Users wishing to customize further labels may explore using the docker-options plugin to attach additional labels during the 'deploy' phase.

docs/template.html

@@ -47,7 +47,7 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Lato:wght@400;700;900&display=swap" rel="stylesheet">
-    
+
     <link href="https://cdn.jsdelivr.net/gh/dokku/dokku@v0.27.10/docs/assets/style.css" rel="stylesheet">
     <!-- <link href="./assets/style.css" rel="stylesheet"> -->
     <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet">
@@ -175,6 +175,7 @@
             <a href="#" class="list-group-item disabled">Proxy Configuration</a>
 
             <a href="/{{NAME}}/networking/proxy-management/" class="list-group-item">Proxy Management</a>
+            <a href="/{{NAME}}/networking/proxies/caddy/" class="list-group-item">Caddy Proxy</a>
             <a href="/{{NAME}}/networking/proxies/nginx/" class="list-group-item">Nginx Proxy</a>
             <a href="/{{NAME}}/networking/proxies/traefik/" class="list-group-item">Traefik Proxy</a>