docs(docs/guide/static-deploy.md): adds Heroku instructions

[NdagiStanley]

Description

This PR adds Heroku instructions to the Deployment options.

Additional context

This PR removed Heroku instructions since they were outdated. This PR adds up-to-date instructions.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[patak-dev]

Thanks for the PR @NdagiStanley. We decided to avoid expanding this guide in favor of adding links to the docs on the services. They can do a better job than us in keeping these instructions up to date. See:

• docs(static-deploy): added deployment instructions for AWS with Flightcontrol  #13679
• docs(static-deploy): add deployment instructions for AWS Amplify Hosting #13882

Apart from this, Heroku no longer counts with a free plan so that was also in part what triggered us to remove it from our guide.

[NdagiStanley]

Well noted @patak-dev