Remove sonarcloud config

Sonarcloud submission has been broken for some time now, and they seem
to have removed the project for inactivity as a result.

.github/workflows/tests.yml

@@ -30,9 +30,3 @@ jobs:
           pip install -r requirements-dev.txt
       - name: Full test with pytest
         run: pytest --cov=. --cov-config=.coveragerc --cov-report xml:coverage.xml
-      - name: SonarCloud scan
-        uses: sonarsource/sonarcloud-github-action@master
-        if: (github.event.sender.login == github.event.repository.owner.login) && (github.repository == 'make-all/tuya-local') && (github.ref == 'main')
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

README.md

@@ -1,7 +1,5 @@
 # Home Assistant Tuya Local component
 
-[![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=make-all_tuya-local&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=make-all_tuya-local) [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=make-all_tuya-local&metric=security_rating)](https://sonarcloud.io/dashboard?id=make-all_tuya-local) [![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=make-all_tuya-local&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=make-all_tuya-local) [![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=make-all_tuya-local&metric=ncloc)](https://sonarcloud.io/dashboard?id=make-all_tuya-local) [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=make-all_tuya-local&metric=coverage)](https://sonarcloud.io/dashboard?id=make-all_tuya-local)
-
 Please report any [issues](https://github.com/make-all/tuya-local/issues) and feel free to raise [pull requests](https://github.com/make-all/tuya-local/pulls).
 [Many others](https://github.com/make-all/tuya-local/blob/main/ACKNOWLEDGEMENTS.md) have contributed their help already.