Change vscode-boot-java in a 'dummy' extension

It pops up a message on activation advising user to uninstall it and
install vscode-spring-boot instead.

vscode-extensions/vscode-boot-java/package.json

@@ -25,31 +25,16 @@
   "activationEvents": [
     "onLanguage:java"
   ],
-  "contributes": {
-    "configuration": {
-      "type": "object",
-      "title": "Boot-Java Configuration",
-      "properties": {
-        "boot-java.boot-hints.on": {
-          "type": "boolean",
-          "default": true,
-          "description": "Enable/Disable Spring running Boot application live hints decorators in the source code"
-        }
-      }
-    }
-  },
   "main": "./out/lib/Main",
   "scripts": {
     "vscode:prepublish": "npm run compile",
     "compile": "tsc -p ./",
     "watch": "tsc -watch -p ./",
     "clean": "rm -fr node_modules out *.vsix package-lock.json",
-    "preinstall": "./scripts/preinstall.sh",
     "postinstall": "node ./node_modules/vscode/bin/install",
     "vsce-package": "vsce package"
   },
   "dependencies": {
-    "commons-vscode": "file:../commons-vscode/commons-vscode-0.1.4.tgz",
     "vscode-languageclient": "^3.4.5"
   },
   "devDependencies": {