Remove discord (#653)

README.md

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 [![MIT License](https://img.shields.io/github/license/apollographql/apollo-federation-subgraph-compatibility)](https://github.com/apollographql/apollo-federation-subgraph-compatibility/blob/main/LICENSE)
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 This monorepo contains test suite that verifies subgraphs compatibility against [Apollo Federation Subgraph Specification](https://www.apollographql.com/docs/federation/subgraph-spec/). This testing suite verifies various Federation features against subgraph implementation. See [compatibility testing docs](./COMPATIBILITY.md) for details on the expected schema and the data sets as well as information about the executed tests. Test suite is packaged as [NPX script](./packages/script/README.md) and [Github Action](https://github.com/apollographql/apollo-federation-subgraph-compatibility-action).