refactor(tools): clean up CircleCI guard code in ci.sh

We'll likely continue using GitHub Actions for CI so the CircleCI specific
guard rails shouldn't be littering the ci.sh script to make it easier
to understand for newcomers.

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

tools/ci.sh

@@ -34,15 +34,6 @@ function mainTask()
     smem --abbreviate --totals --system || true
   fi
 
-  # Travis does not have (nor need) nvm but CircleCI does have nvm and also
-  # need it big time because their default Node version is 6.x...
-  if [ "${CIRCLECI:-false}" = "true" ]; then
-    set +x
-    nvm install 10.19.0
-    nvm alias default 10.19.0
-    set -x
-  fi
-
   docker --version
   docker-compose --version
   node --version