General Improvements (#70)

# General Improvements

> This is a classic @GrantBirki drive-by PR 🚗

This pull request does the following:

- Lightly updates and formats a few existing Actions workflows
- Adds a new `package-check` workflow to validate the contents of the
`dist/` directory have been properly built
- Uses a `.node-version` file so that local development and Actions
remain on the same pinned version of node
- Adds status badges to the readme for visual effect ⭐ 🎨

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "create-github-app-token",
-  "version": "1.5.0",
+  "version": "1.5.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "create-github-app-token",
-      "version": "1.5.0",
+      "version": "1.5.1",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.10.1",