Eliminate npm tests (RIPD-1369)

Remove mention of npm tests in developer docs. Eliminate `npm test` from
automation and ci scripts.

bin/ci/ubuntu/build-and-test.sh

@@ -89,8 +89,4 @@ if [[ $TARGET == "coverage" ]]; then
   codecov -X gcov # don't even try and look for .gcov files ;)
 fi
 
-if [[ ${APP} == "rippled" ]]; then
-  # Run NPM tests
-  npm install --progress=false
-  npm test --rippled=$APP_PATH
-fi
+

bin/ci/ubuntu/install-dependencies.sh

@@ -53,11 +53,6 @@ if [ -x $HOME/bin/g++ ]; then
     $HOME/bin/g++ -v
 fi
 
-# Avoid `spurious errors` caused by ~/.npm permission issues
-# Does it already exist? Who owns? What permissions?
-ls -lah ~/.npm || mkdir ~/.npm
-# Make sure we own it
-chown -Rc $USER ~/.npm
 pip install --user https://github.com/codecov/codecov-python/archive/master.zip
 
 bash bin/sh/install-boost.sh