docs: update links to help.github.com

Content from help.github.com has been moved to docs.github.com and restructured. The README links are updating accordingly.

README.md

@@ -1,6 +1,6 @@
 # cypress-io/github-action [![renovate-app badge][renovate-badge]][renovate-app] [![Action status](https://github.com/cypress-io/github-action/workflows/main/badge.svg?branch=master)](https://github.com/cypress-io/github-action/actions)
 
-> [GitHub Action](https://help.github.com/en/actions) for running [Cypress](https://www.cypress.io) end-to-end tests. Includes NPM installation, custom caching and lots of configuration options.
+> [GitHub Action](https://docs.github.com/en/actions) for running [Cypress](https://www.cypress.io) end-to-end tests. Includes NPM installation, custom caching and lots of configuration options.
 
 ## Examples
 
@@ -790,7 +790,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```
 
-**Tip:** see GitHub Actions [environment variables](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/using-environment-variables) and [expression syntax](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/contexts-and-expression-syntax-for-github-actions).
+**Tip:** see [Learn GitHub Actions](https://docs.github.com/en/actions/learn-github-actions), with sections on Expressions, Contexts and Environment variables.
 
 ### Robust custom build id
 
@@ -1146,7 +1146,7 @@ Read [DEVELOPMENT.md](DEVELOPMENT.md)
 
 - Read our blog post [Drastically Simplify Testing on CI with Cypress GitHub Action](https://www.cypress.io/blog/2019/11/20/drastically-simplify-your-testing-with-cypress-github-action/)
 - Read [Test the Preview Vercel Deploys](https://glebbahmutov.com/blog/develop-preview-test/) blog post
-- [Building actions](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/building-actions) docs
+- [Creating actions](https://docs.github.com/en/actions/creating-actions) docs
 - practice using the Cypress GitHub Action by following the [Cypress on CI Workshop](https://github.com/cypress-io/cypress-workshop-ci)
 
 ## Extras