Add installation docs

[guineveresaenger]

Part of pulumi/home#3598

Currently blocked on minor changes in the bridge.

Generates index.md file with relevant content and adds automation.

This pull request also adds a global docs rule to replace Terraform Workspace with Pulumi Stack. It came up in the index doc, but multiple examples in this provider benefit from this replacement. I'm opening a bridge PR as well since this may benefit other providers.

• Add docs automation for index.md file
• Move docs edits to separate file
• Generate schema and docs with new docs rule for Terraform Workspace -> Pulumi Stack

[github-actions[bot]]

Does the PR have any schema changes?

Looking good! No breaking changes found. No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[pulumi-bot]

This PR has been shipped in release v2.9.1.