Automate response to PRs trying to update commands (#969)

* Automate response to PRs trying to update commands

We frequently see PRs that try to fix or improve command docs. As the
pages are autogenerated this is a futile endeavour.

We regularly have to respond to them and close the PR.

Attempt to provide a workflow that will react to PRs that affect the
command docs path and send a comment.
I don't autoclose for now, as the autogenerated still come in as a PR.

* Try to tweak body for correct markdown

* Resort to basic js

.github/workflows/command-block.yml

@@ -0,0 +1,25 @@
+name: Comment on manual command changes
+on:
+ pull_request:
+ paths:
+ - 'commands/docs/**'
+
+jobs:
+ comment:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/github-script@v6
+ with:
+ script: |
+ github.rest.issues.createComment({
+ issue_number: context.issue.number,
+ owner: context.repo.owner,
+ repo: context.repo.repo,
+ body: 'Awesome that you are trying to improve the documentation of a nushell command!\n\n' +
+ 'As we autogenerate these command pages from the help information defined with the command after each release:\n'+
+ '- If you already updated the command help, you are already done!\n'+
+ '- Else, please look for the command in the [source tree](https://github.com/nushell/nushell/tree/main/crates) and make your changes directly there.\n\n'+
+ 'Thanks for helping out!'
+ })
+
+