fix(posts): fix broken npm links

- 2018-08-14-package-json-version.md
- 2020-12-11-migrate-travis-ci-to-github-actions-nodejs-workflow.md

```
External link https://docs.npmjs.com/cli-commands/run-script.html failed (status code 404)
```

Author: remarkablemark

_posts/2018/2018-08-14-package-json-version.md

@@ -39,7 +39,7 @@ Print out all the package.json vars:
 npm run env | grep npm_package_
 ```
 
-Get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run-script):
+Get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run):
 
 ```js
 // package.json
@@ -69,7 +69,7 @@ jq -r .version package.json
 
 > The `-r` option outputs the **raw** string (so it's `1.2.3` instead of `"1.2.3"`).
 
-To get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run-script):
+To get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run):
 
 ```js
 // package.json
@@ -97,7 +97,7 @@ Pass the [`-p`](https://nodejs.org/api/cli.html#cli_p_print_script) option to pr
 node -p "require('./package').version"
 ```
 
-To get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run-script):
+To get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run):
 
 ```js
 // package.json
@@ -119,7 +119,7 @@ To match `package.json` against the regex pattern `/"version": ".+"/` and print
 awk -F'"' '/"version": ".+"/{ print $4; exit; }' package.json
 ```
 
-To get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run-script):
+To get the "version" using a [run-script](https://docs.npmjs.com/cli/commands/npm-run):
 
 ```js
 // package.json

_posts/2020/2020-12-11-migrate-travis-ci-to-github-actions-nodejs-workflow.md

@@ -182,7 +182,7 @@ steps:
 
 ### steps.run
 
-[`steps.run`](https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstepsrun) runs the commands. The commands can be [npm scripts](https://docs.npmjs.com/cli/v6/commands/npm-run-script/) from `package.json` or other bash commands.
+[`steps.run`](https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#jobsjob_idstepsrun) runs the commands. The commands can be [npm scripts](https://docs.npmjs.com/cli/commands/npm-run) from `package.json` or other bash commands.
 
 ```yml
 steps: