feat: command to upgrade outline (#1727)

* Add upgrade script to package.json

* Update the docs to include docker and yarn guides

package.json

@@ -17,6 +17,7 @@
     "heroku-postbuild": "yarn build && yarn sequelize:migrate",
     "sequelize:create-migration": "sequelize migration:create",
     "sequelize:migrate": "sequelize db:migrate",
+    "upgrade": "git fetch && git pull && yarn install && yarn heroku-postbuild",
     "test": "yarn test:app && yarn test:server",
     "test:app": "jest",
     "test:server": "jest --config=server/.jestconfig.json --runInBand --forceExit",