Add server.http.base-path to documentation

Author: nickamzol

docs/topics/configuration.md

@@ -124,6 +124,7 @@ server:
     max-upload-size: 50000000
     request-timeout: 60000
     graceful-shutdown: true
+    base-path: /
 ```
 
 <deflist>
@@ -145,6 +146,9 @@ server:
         Shutdowns will take no longer than the request timeout configured by <code>server.http.request.timeout</code>.
         If disabled, the process is stopped immediately, which will potentially lead to incomplete responses for outstanding requests.
     </def>
+    <def title="server.http.base-path" id="server.http.base-path">
+        Sets the base path for all HTTP endpoints.
+    </def>
 </deflist>
 
 ## DIMSE Server Config