Update server.md to add http server options for server (#2338)

* Update server.md to add http server  options for server

Update server.md to add http server  options for server, including TRACETEST_SERVER_HTTPPORT and TRACETEST_SERVER_PATHPREFIX

* Apply suggestions from code review

Co-authored-by: Adnan Rahić <[email protected]>

---------

Co-authored-by: Adnan Rahić <[email protected]>

Author: kdhamric

docs/docs/configuration/server.md

@@ -26,6 +26,11 @@ The list of environment variables and example values is:
 - `TRACETEST_POSTGRES_PASSWORD: "postgres"`
 - `TRACETEST_POSTGRES_PARAMS: ""`
 
+You can also change the defaults for the Tracetest server, altering the port and path you access the dashboard from. For a Docker-based install done locally, this URL is typically `http://localhost:11633/`. You can alter it by setting either of the environment variables or using the `server` object in the server configuration file:
+
+- `TRACETEST_SERVER_HTTPPORT=11633`
+- `TRACETEST_SERVER_PATHPREFIX="/"`
+
 
 You can also intitalize the server with a number of resources the first time it is launched by using [provisioning](./provisioning).