Cleanup: Remove manual trace server start in gitpod

The server has been managed automatically (start/stop) since PR #298.
Removing the manual trace server start reduces possible sources of bugs
because of interference with the manual and automatic server
management.

Fixes #319

Signed-off-by: Erica Bugden <erica.bugden@gmail.com>

.gitpod.yml

@@ -16,8 +16,6 @@ ports:
 tasks:
 - init: >
     yarn download:server
-  command: >
-    yarn start:server
 - init: >
     yarn download:sample-traces &&
     yarn