docs: remove log4net (#228)

docs/setup.asciidoc

@@ -1,8 +1,6 @@
 [[setup]]
 == Get Started
 
-include::./tab-widgets/code.asciidoc[]
-
 [float]
 [[setup-step-1]]
 === Step 1: Configure application logging
@@ -11,7 +9,6 @@ The following logging frameworks are supported:
 
 * Serilog
 * NLog
-* log4net
 
 [float]
 ==== Add the dependency

docs/tab-widgets/ecs-integration-widget.asciidoc

@@ -14,13 +14,6 @@
             tabindex="-1">
       NLog
     </button>
-    <button role="tab"
-            aria-selected="false"
-            aria-controls="log4net-tab-ecs-integration"
-            id="log4net-ecs-integration"
-            tabindex="-1">
-      log4net
-    </button>
   </div>
   <div tabindex="0"
        role="tabpanel"
@@ -41,17 +34,6 @@ include::ecs-integration.asciidoc[tag=serilog]
 
 include::ecs-integration.asciidoc[tag=nlog]
 
-++++
-  </div>
-  <div tabindex="0"
-       role="tabpanel"
-       id="log4net-tab-ecs-integration"
-       aria-labelledby="log4net-ecs-integration"
-       hidden="">
-++++
-
-include::ecs-integration.asciidoc[tag=log4net]
-
 ++++
   </div>
 </div>

docs/tab-widgets/ecs-integration.asciidoc

@@ -250,6 +250,10 @@ information for an event
 // end::nlog[]
 
 // tag::log4net[]
+// These docs are currently not included in the documentation.
+// See this comment for details: https://github.com/elastic/sdh-apm/issues/759#issuecomment-1299789675.
+// To readd these docs, update the widget to include them.
+
 **log4net Layout**
 
 `EcsLayout` is a `ILayout` implementation in Elastic.CommonSchema.Log4net that