docs: contributing and readme update

[KT-Doan]

Description

Updating Docs

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING guide
• My code follows the existing code style
• I have added tests that prove my fix/feature works
• I have updated documentation as needed
• All new and existing tests pass (make test)
• I have run the linter (make format)

[Copilot]

Pull request overview

Updates contributor-facing documentation and the local pre-commit hook to reflect current development workflows for the Terraform Ory provider.

Changes:

• Align README/CONTRIBUTING guidance with Makefile targets (deps, format, test-short, sec-trivy) and clarify .env usage for acceptance tests.
• Update local dev override instructions to use the ory/ory provider source.
• Adjust .githooks/pre-commit messaging and golangci-lint discovery order.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
README.md	Updates requirements, acceptance-test env var guidance, and local/CI check commands.
CONTRIBUTING.md	Refreshes dev setup steps, test instructions, feature-flag notes, and pre-commit checklist.
.githooks/pre-commit	Updates formatting hint and changes how golangci-lint is located/executed.

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