Prepare the repo before making it public

[damianstasik]

Before we can switch the visibility it would be great to have:

• Basic readme describing that we are using Docusaurus (meaning we also use React), Tailwind for styling and TS for type safety. The readme should also include a quick instruction about how to get the website started locally.
• Issue template (bug report, improvement idea)
• PR template (description and basic checklist)
• Linting and code formatting set up along with git hooks
• PRs requiring at least one approval and a successful deployment before merging
• Workflows requiring a manual approval for external contributions (after the repo is public)
• Main branch protected
• Repo name should be changed to opentofu.org
• Remaining issues should have clear description

[damianstasik]

Done and done!