Remove old contributor doc, update asdf go version

.tool-versions

@@ -1 +1 @@
-golang 1.21.0
+golang 1.21.5

README.md

@@ -2,57 +2,5 @@
 
 This is the official Terraform provider for [CloudTruth](https://cloudtruth.com/)
 
-## Requirements
+## Documentation (coming soon)
 
--	[Terraform](https://www.terraform.io/downloads.html) >= 0.15.x
--	[Go](https://golang.org/doc/install) >= 1.20
-
-## Building The Provider
-
-1. Clone the repository
-1. Enter the repository directory
-1. Build the provider using the Go `install` command:
-```sh
-$ go install
-```
-
-## Adding Dependencies
-
-This provider uses [Go modules](https://github.com/golang/go/wiki/Modules).
-Please see the Go documentation for the most up to date information about using Go modules.
-
-To add a new dependency `github.com/author/dependency` to your Terraform provider:
-
-```
-go get github.com/author/dependency
-go mod tidy
-```
-
-Then commit the changes to `go.mod` and `go.sum`.
-
-## Developing the Provider
-
-If you wish to work on the provider, you'll first need [Go](http://www.golang.org) installed on your machine (see [Requirements](#requirements) above).
-
-To compile the provider, run `go install`. This will build the provider and put the provider binary in the `$GOPATH/bin` directory.
-
-To generate or update documentation, run `go generate`.
-
-In order to run the full suite of Acceptance tests, run `make testacc`.
-
-*Note:* Acceptance tests create real resources, and often cost money to run.
-
-If you run the tests in a fork of this repo, you will need to recreate the boilerplate CloudTruth resources which exist in the dedicated
-acceptance test account. We will provide a bootstrapping script to ensure that these resource exist in your account.
-
-Additionally, you will need to specify the target CloudTruth project and environment(s) as well as your CloudTruth API key. You can
-specify the API key with a `TF_VAR_cloudtruth_api_key` environment variable or with a `CLOUDTRUTH_API_KEY` environment variable (a la the CloudTruth
-CLI). You can specify the the project and/or environments inline in your HCL files or via the `CLOUDTRUTH_PROJECT` and `CLOUDTRUTH_ENVIRONMENT`
-environment variables.
-
-```sh
-$ make testacc
-```
-
-### Commit hooks
-To enable the commit hooks stored in `.githooks` in your local repo, run `git config --local core.hooksPath .githooks/`