Remove experimental notice: (#803)

## Description



Tink has been reported in use by many people and companies in the community.

## Why is this needed



Fixes: #

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

README.md

@@ -2,11 +2,8 @@
 
 [![Build Status](https://github.com/tinkerbell/tink/workflows/For%20each%20commit%20and%20PR/badge.svg)](https://github.com/tinkerbell/tink/actions?query=workflow%3A%22For+each+commit+and+PR%22+branch%3Amain)
 [![codecov](https://codecov.io/gh/tinkerbell/tink/branch/main/graph/badge.svg)](https://codecov.io/gh/tinkerbell/tink)
-![](https://img.shields.io/badge/Stability-Experimental-red.svg)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/4512/badge)](https://bestpractices.coreinfrastructure.org/projects/4512)
 
-This repository is [Experimental](https://github.com/packethost/standards/blob/main/experimental-statement.md) meaning that it's based on untested ideas or techniques and not yet established or finalized or involves a radically new and innovative style! This means that support is best effort (at best!) and we strongly encourage you to NOT use this in production.
-
 ## License
 
 Tinkerbell is licensed under the Apache License, Version 2.0. See [LICENSE](./LICENSE) for the full license text. Some of the projects used by the Tinkerbell project may be governed by a different license, please refer to its specific license.