message: docs: update local install example for node v14
diff: @@ -8,19 +8,19 @@ description: Documentation on How to run Backstage Locally
  - Node.js
  -First make sure you are using Node.js with an Active LTS Release, currently v12.
  +First make sure you are using Node.js with an Active LTS Release, currently v14.
  This is made easy with a version manager such as
  [nvm](https://github.com/nvm-sh/nvm) which allows for version switching.
  ```bash
  # Installing a new version
  -nvm install 12
  -> Downloading and installing node v12.18.3...
  -> Now using node v12.18.3 (npm v6.14.6)
  +nvm install 14
  +> Downloading and installing node v14.15.1...
  +> Now using node v14.15.1 (npm v6.14.8)
  # Checking your version
  node --version
  -> v12.18.3
  +> v14.15.1
  ```
  - Yarn
  