chore: remove docs about a local provider, can use pre-release

CONTRIBUTING.md

@@ -1,31 +1,5 @@
 # Development
 
-Currently, a branch of the coder terraform provider is required.
-
-1. Git clone `[email protected]:coder/terraform-provider-coder.git`
-
-- Checkout branch `stevenmasley/form_control`
-- Build the provider with `go build -o terraform-provider-coder`
-
-1. Create a file named `.terraformrc` in your `$HOME` directory
-1. Add the following content:
-
-```hcl
- provider_installation {
-     # Override the coder/coder provider to use your local version
-     dev_overrides {
-       "coder/coder" = "/path/to/terraform-provider-coder"
-     }
-
-     # For all other providers, install them directly from their origin provider
-     # registries as normal. If you omit this, Terraform will _only_ use
-     # the dev_overrides block, and so no other providers will be available.
-     direct {}
- }
-```
-
-Now you are using the right terraform provider.
-
 To run preview:
 
 1. `cd site`