docs: refine heading badges in README (#2770)

* docs: refine heading badges in README

* docs: consistency across langs

README.md

@@ -1,27 +1,14 @@
 # Testcontainers
 
-[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=141451032&machine=standardLinux32gb&devcontainer_path=.devcontainer%2Fdevcontainer.json&location=EastUs)
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-**Builds**
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 [![Main pipeline](https://github.com/testcontainers/testcontainers-go/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/testcontainers/testcontainers-go/actions/workflows/ci.yml)
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-**Documentation**
-
 [![GoDoc Reference](https://pkg.go.dev/badge/github.com/testcontainers/testcontainers-go.svg)](https://pkg.go.dev/github.com/testcontainers/testcontainers-go)
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-**Social**
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-[![Slack](https://img.shields.io/badge/Slack-4A154B?logo=slack)](https://testcontainers.slack.com/)
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-**Code quality**
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 [![Go Report Card](https://goreportcard.com/badge/github.com/testcontainers/testcontainers-go)](https://goreportcard.com/report/github.com/testcontainers/testcontainers-go)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=testcontainers_testcontainers-go&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=testcontainers_testcontainers-go)
+[![License](https://img.shields.io/badge/license-MIT-blue)](https://github.com/testcontainers/testcontainers-go/blob/main/LICENSE)
 
-**License**
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=141451032&machine=standardLinux32gb&devcontainer_path=.devcontainer%2Fdevcontainer.json&location=EastUs)
 
-[![License](https://img.shields.io/badge/license-MIT-blue)](https://github.com/testcontainers/testcontainers-go/blob/main/LICENSE)
+[![Join our Slack](https://img.shields.io/badge/Slack-4A154B?logo=slack)](https://testcontainers.slack.com/)
 
 _Testcontainers for Go_ is a Go package that makes it simple to create and clean up container-based dependencies for
 automated integration/smoke tests. The clean, easy-to-use API enables developers to programmatically define containers