Remove gitter links

Author: roji

conceptual/EFCore.PG/index.md

@@ -4,7 +4,6 @@
 [![next patch](https://img.shields.io/myget/npgsql/v/Npgsql.EntityFrameworkCore.PostgreSQL.svg?label=next%20patch)](https://www.myget.org/feed/npgsql/package/nuget/Npgsql.EntityFrameworkCore.PostgreSQL)
 [![vnext](https://img.shields.io/myget/npgsql-vnext/vpre/Npgsql.EntityFrameworkCore.PostgreSQL.svg?label=vnext)](https://www.myget.org/feed/npgsql-vnext/package/nuget/Npgsql.EntityFrameworkCore.PostgreSQL)
 [![build](https://img.shields.io/github/actions/workflow/status/npgsql/efcore.pg/build.yml?branch=main)](https://github.com/npgsql/efcore.pg/actions)
-[![gitter](https://img.shields.io/badge/gitter-join%20chat-brightgreen.svg)](https://gitter.im/npgsql/npgsql)
 
 Npgsql has an Entity Framework (EF) Core provider. It behaves like other EF Core providers (e.g. SQL Server), so the [general EF Core docs](https://docs.microsoft.com/ef/core/index) apply here as well. If you're just getting started with EF Core, those docs are the best place to start.
 

conceptual/Npgsql/index.md

@@ -4,7 +4,6 @@
 [![next patch](https://img.shields.io/myget/npgsql/v/npgsql.svg?label=next%20patch)](https://www.myget.org/feed/npgsql/package/nuget/Npgsql)
 [![vnext](https://img.shields.io/myget/npgsql-vnext/v/npgsql.svg?label=vnext)](https://www.myget.org/feed/npgsql-vnext/package/nuget/Npgsql)
 [![build](https://img.shields.io/github/actions/workflow/status/npgsql/npgsql/build.yml?branch=main)](https://github.com/npgsql/npgsql/actions)
-[![gitter](https://img.shields.io/badge/gitter-join%20chat-brightgreen.svg)](https://gitter.im/npgsql/npgsql)
 
 The best way to use Npgsql is to install its [nuget package](https://www.nuget.org/packages/Npgsql/).