Fixup status badges in README.md (#8222)

- Fixup several references to the old Solana Labs repo
- Replace solana-core links with agave-validator

README.md

@@ -4,10 +4,11 @@
   </a>
 </p>
 
-[![Solana crate](https://img.shields.io/crates/v/solana-core.svg)](https://crates.io/crates/solana-core)
-[![Solana documentation](https://docs.rs/solana-core/badge.svg)](https://docs.rs/solana-core)
-[![Build status](https://badge.buildkite.com/8cc350de251d61483db98bdfc895b9ea0ac8ffa4a32ee850ed.svg?branch=master)](https://buildkite.com/solana-labs/solana/builds?branch=master)
-[![codecov](https://codecov.io/gh/solana-labs/solana/branch/master/graph/badge.svg)](https://codecov.io/gh/solana-labs/solana)
+[![Agave validator](https://img.shields.io/crates/v/agave-validator.svg)](https://crates.io/crates/agave-validator)
+[![Agave documentation](https://docs.rs/agave-validator/badge.svg)](https://docs.rs/agave-validator)
+[![Build status](https://badge.buildkite.com/b2b925facfdbb575573084bb4b7e1f1ce7f395239672941bf7.svg?branch=master)](https://buildkite.com/anza/agave-secondary)
+[![Release status](https://github.com/anza-xyz/agave/actions/workflows/release.yml/badge.svg)](https://github.com/anza-xyz/agave/actions/workflows/release.yml)
+[![codecov](https://codecov.io/gh/anza-xyz/agave/branch/master/graph/badge.svg)](https://codecov.io/gh/anza-xyz/agave)
 
 # Building